* docs: Remove safe-mix since is no longer local dependency
* docs: Fix existing packages link. Still only includes Substrate Core
* docs: Remove empty package Readmes. Remove old docs links. Rename to Readme
* docs: Remove link to old docs
* misc: Merge latest from master. Renaem to sr-metadata. Fix list of RustDoc package names
* Rename substrate-metadata to sr-metadata, since it is in the "srml" subdirectory
* Change example to use package name that opens all packages in RustDocs
* Fix list of packages names that are available to open in RustDocs
* fix typo
* fix ordering of CLI options and add missing backslash