Add reference to the forum to README and issue templates.

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -6,7 +6,7 @@ body:
       value: |
         Thanks for taking the time to file a bug report. Here are some tips:
 
-        - Please only use this form for bugs in Elvish. If you need help with using Elvish, the user group (linked from the repo README) is a more suitable place.
+        - Please only use this form for bugs in Elvish. If you need help with using Elvish, the forum or chatroom (linked from the repo README) are more suitable places.
         - Please search existing issues to see if the same or similar report has been filed before.
   - type: textarea
     id: content

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -6,7 +6,7 @@ body:
       value: |
         Thanks for taking the time to file a feature request. Here are some tips:
 
-        - Please only use issues for feature requests for Elvish. If you need help with using Elvish, the user group (linked from the repo README) is a more suitable place.
+        - Please only use issues for feature requests for Elvish. If you need help with using Elvish, the forum or chatroom (linked from the repo README) is a more suitable place.
         - Please search existing issues to see if the same or similar report has been filed before.
   - type: textarea
     id: content

README.md

@@ -5,16 +5,17 @@
 [![Test Coverage](https://img.shields.io/codecov/c/github/elves/elvish/master.svg?logo=Codecov&label=coverage)](https://app.codecov.io/gh/elves/elvish/tree/master)
 [![Go Reference](https://pkg.go.dev/badge/src.elv.sh@master.svg)](https://pkg.go.dev/src.elv.sh@master)
 [![Packaging status](https://repology.org/badge/tiny-repos/elvish.svg)](https://repology.org/project/elvish/versions)
-[![Twitter](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/ElvishShell)
+
+[![Forum](https://img.shields.io/badge/forum-bbs.elv.sh-5b5.svg?logo=discourse)](https://bbs.elv.sh)
+[![Twitter](https://img.shields.io/badge/twitter-@ElvishShell-blue.svg?logo=x)](https://twitter.com/ElvishShell)
 
 [![Telegram Group](https://img.shields.io/badge/telegram-Elvish-blue.svg?logo=telegram&logoColor=white)](https://t.me/+Pv5ZYgTXD-YaKwcP)
 [![Discord server](https://img.shields.io/badge/discord-Elvish-blue.svg?logo=discord&logoColor=white)](https://discord.gg/jrmuzRBU8D)
 [![#users:elv.sh](https://img.shields.io/badge/matrix-%23users:elv.sh-blue.svg?logo=matrix)](https://matrix.to/#/#users:elv.sh)
 [![#elvish on libera.chat](https://img.shields.io/badge/libera.chat-%23elvish-blue.svg?logo=liberadotchat&logoColor=white)](https://web.libera.chat/#elvish)
 [![Gitter](https://img.shields.io/badge/gitter-elves%2Felvish-blue.svg?logo=gitter)](https://gitter.im/elves/elvish)
 
-(All chat rooms are all bridged together thanks to
-[Matrix](https://matrix.org).)
+(Chat rooms are all bridged together thanks to [Matrix](https://matrix.org).)
 
 Elvish is: