* restore main readme.md
* add ChangeLog entry for 2021-02-27 develop branch - initial version
* update Docs; consolidate sidebar entries to new Breaking Changes History doc
* Changelog update
- concatenate similar changes as one list item
- unify change formatting (remove [bracketed] headings and trailing periods)
- item sorting improvement
* update Changes Requiring User Action section
Detail the changes regarding keyboard relocations/additions/deletions.
* add entry for fauxpark's user keymap cleanup for config.h/rules.mk
* add link to Jacky Studio bugfix PR
* add link for "ChibiOS conf migrations... take 15"
* add links for "Make LAYOUT parsing more robust" and "Massdrop develop rgb fix"
* remove sort sequence numbers
* rename Breaking Changes History page
Renames the Breaking Changes History page to "Past Breaking Changes".
* update schedule in Breaking Changes Overview
* suggestions/changes per tzarc
* skully's changes
* add entry for "Fix develop" (PR 12039)
Co-authored-by: Nick Brassel <nick@tzarc.org>
Co-authored-by: Zach White <skullydazed@gmail.com>
