fix: Fix matrix links (#1470)

.github/ISSUE_TEMPLATE/config.yml

@@ -2,7 +2,7 @@ blank_issues_enabled: true
 
 contact_links:
   - name: Matrix community
-    url: https://matrix.to/#/+atmachine:matrix
+    url: https://matrix.to/#/#atmachine-neovim:matrix.org
     about: Please ask and answer questions on Matrix.
   - name: Discord community
     url: https://discord.gg/Xb9B4Ny

CONTRIBUTING.md

@@ -66,4 +66,4 @@ shfmt -i 2 -ci -l -d .
 Members of the community have multiple ways to collaborate on the project.
 We encourage you to join the community:
 - [Discord server](https://discord.gg/Xb9B4Ny)
-- [Matrix server](https://matrix.to/#/+atmachine:matrix)
+- [Matrix server](https://matrix.to/#/#atmachine-neovim:matrix.org)