PRDoc new schema (#1946)

## Overview

This PR brings in the new version of prdoc v0.0.6 and allows:
- local schema
- local config
- local template

It also fixes the existing prdoc files to match the new schema.

## todo

- [x] add a brief doc/tldr to help contributors get started
- [x] test CI
- [x] finalize schema
- [x] publish the next `prdoc` cli version (v0.0.7 or above)

---------

Co-authored-by: Egor_P <egor@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>

.github/review-bot.yml

@@ -1,7 +1,7 @@
 rules:
   - name: CI files
     condition:
-      include: 
+      include:
         - ^\.gitlab-ci\.yml
         - ^docker/.*
         - ^\.github/.*
@@ -19,12 +19,12 @@ rules:
   - name: Audit rules
     type: basic
     condition:
-      include: 
+      include:
         - ^polkadot/runtime\/(kusama|polkadot|common)\/.*
         - ^polkadot/primitives/src\/.+\.rs$
         - ^substrate/primitives/.*
         - ^substrate/frame/.*
-      exclude: 
+      exclude:
         - ^polkadot/runtime\/(kusama|polkadot)\/src\/weights\/.+\.rs$
         - ^substrate\/frame\/.+\.md$
     minApprovals: 1
@@ -80,7 +80,7 @@ rules:
   # if there are any changes in the bridges subtree (in case of backport changes back to bridges repo)
   - name: Bridges subtree files
     type: basic
-    condition: 
+    condition:
       include:
         - ^bridges/.*
     minApprovals: 1
@@ -91,7 +91,7 @@ rules:
 
   - name: FRAME coders substrate
     condition:
-      include: 
+      include:
         - ^substrate/frame/(?!.*(nfts/.*|uniques/.*|babe/.*|grandpa/.*|beefy|merkle-mountain-range/.*|contracts/.*|election|nomination-pools/.*|staking/.*|aura/.*))
     type: "and"
     reviewers:
@@ -105,7 +105,7 @@ rules:
   # Protection of THIS file
   - name: Review Bot
     condition:
-      include: 
+      include:
         - review-bot\.yml
     type: "and"
     reviewers: