Community: Update Gitter links to Matrix, Update Badges, Remove editor extensions (#9898)

* Community: Update Gitter links to Matrix

* Update MAINTAINERS Chatroom links (2021-2013)

Signed-off-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

* Update Final Gitter Links with Issue, Fix wrong date

* COMMUNITY-ROLES: add Matrix link

* Remove Space in Issue template

* Apply suggestions from code review

Co-authored-by: Waldir Pimenta <waldyrious@gmail.com>

* Update MAINTAINERS.md

* Update matrix badge

* CONTRIBUTING: Update matrix badge

* README: Update badges

* CONTRIBUTING: Update badges

* README: Remove editor extensions

---------

Signed-off-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Waldir Pimenta <waldyrious@gmail.com>

contributing-guides/maintainers-guide.md

@@ -25,7 +25,7 @@ as a guideline for current and future maintainers.
   You can respond yourself
   or ask other members to provide their thoughts/opinions.
   In addition, if possible, try to hang around in the
-  [Gitter chat room](https://gitter.im/tldr-pages/tldr)
+  [Matrix chat room](https://matrix.to/#/#tldr-pages:matrix.org)
   on a regular basis as well, or at least show up every now and then.
 
 - **Know when and how to say no**.