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Move developer-hub to polkadot-sdk-docs (#2598)
This PR is a continuation of https://github.com/paritytech/polkadot-sdk/pull/2102 and part of an initiative started here https://hackmd.io/@romanp/rJ318ZCEp What has been done: - The content under `docs/*` (with the exception of `docs/mermaid`) has been moved to `docs/contributor/` - Developer Hub has been renamed to Polkadot SDK Docs, and the crate has been renamed from `developer-hub` to `polkadot-sdk-docs` - The content under `developer-hub/*` has been moved to `docs/sdk` --- Original PR https://github.com/paritytech/polkadot-sdk/pull/2565, it has been close due to too many rebase conflicts --------- Co-authored-by: Serban Iorga <serban@parity.io> Co-authored-by: Chevdor <chevdor@users.noreply.github.com> Co-authored-by: Egor_P <egor@parity.io> Co-authored-by: Bastian Köcher <git@kchr.de>
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# Deprecation Checklist
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This deprecation checklist makes sense while we don’t use [SemVer](https://semver.org/).
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After that, this document will most likely change.
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As deprecation and removal of existing code can happen on any release, we need to be mindful that external builders
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could be impacted by the changes we make.
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The deprecation checklist tries to mitigate this impact, while still keeping the developer experience, the DevEx, as
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smooth as possible.
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To start a deprecation process, a new issue with the label `T15-deprecation` needs to be created for correct tracking.
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Then these are the actions to take:
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## Hard deprecate by adding a warning message
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The warning message shall include a removal month and year, which is suggested to be 6 months after the deprecation
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notice is released.
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This means that the code will be removed in a release within that month (or after, but never before). Please use this
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template, doing so makes it easy to search through the code base:
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```rust
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#[deprecated(note = "[DEPRECATED] will be removed after [DATE]. [ALTERNATIVE]")]
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```
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`[ALTERNATIVE]` won't always be possible but offer it if it is.
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E.g.
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```rust
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#[deprecated(note = "`GenesisConfig` will be removed after December 2023. Use `RuntimeGenesisConfig` instead.")]
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```
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Some pieces of code cannot be labeled as deprecated, like [reexports](https://github.com/rust-lang/rust/issues/30827)
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or [dispatchables](https://github.com/paritytech/polkadot-sdk/issues/182#issuecomment-1691684159), for instance.
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In cases like that we can only make a visible enough comment, and make sure that we [announce the deprecation properly](#announce-the-deprecation-and-removal).
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## Remove usage of the deprecated code in the code base
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Just make sure that we are not using the deprecated code ourselves.
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If you added the deprecation warning from the previous step, this can be done by making sure that warning is not shown
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when building the code.
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## Update examples and tutorials
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Make sure that the rust docs are updated.
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We also need [https://docs.substrate.io/](https://docs.substrate.io/) to be updated accordingly. The repo behind it is
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[https://github.com/substrate-developer-hub/substrate-docs](https://github.com/substrate-developer-hub/substrate-docs).
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## Announce the deprecation and removal
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**At minimum they should be noted in the release log.** Please see how to document a PR [here](https://github.com/paritytech/polkadot-sdk/blob/master/docs/contributor/CONTRIBUTING.md#documentation).
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There you can give instructions based on the audience and tell them what they need to do to upgrade the code.
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Some breaking changes have a bigger impact than others. When the impact is big the release note is not enough, though
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it should still be the primary place for the notice. You can link back to the changelog files in other channels if you
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want to announce it somewhere else.
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Make sure you are as loud as you need to be for the magnitude of the breaking change.
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## Removal version is planned
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Depending on the removal date indicated in the deprecation warning in the [first step](#hard-deprecate-by-adding-a-warning-message),
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the nature and the importance of the change, it might make sense to coordinate the release with other developers and
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with the Release team.
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## Deprecated code is removed
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The deprecated code finally gets removed.
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Don’t forget to [announce this accordingly](#announce-the-deprecation-and-removal).
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✅ In order to not forget any of these steps, consider using this template in your deprecation issue:
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```markdown
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### Tasks
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- [ ] Deprecate code by adding a warning message
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- [ ] Remove usage of the deprecated code in the code base
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- [ ] Update examples and tutorials
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- [ ] Announce code deprecation
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- [ ] Plan removal version
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- [ ] Announce code removal
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- [ ] Remove deprecated code
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```
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