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>

.github/ISSUE_TEMPLATE/config.yml

@@ -1,8 +1,5 @@
 blank_issues_enabled: true
 contact_links:
-  - name: Gitter chat
-    url: https://gitter.im/tldr-pages/tldr
-    about: You can ask and answer questions here
-  - name: Matrix Space
+  - name: Chat room
     url: https://matrix.to/#/#tldr-pages:matrix.org
-    about: Matrix view of our Gitter chat rooms
+    about: Consider joining the chat room to discuss your issue, question or suggestion with the community before opening an issue.