teams: update NGI team (#1916)

* Remove redundant email and matrix links
* Add link to our packages overview page

Author: imincik

core/src/content/teams/160_ngi.mdx

@@ -78,23 +78,11 @@ For questions or comments, please [contact the team](https://github.com/ngi-nix/
 import Button from '../../components/ui/Button.astro';
 
 <div class="flex flex-wrap gap-4">
-  <Button
-    color="semidarkblue"
-    size="sm"
-    href="mailto:[email protected]"
-    label="Email"
-  />
-  <Button
-    color="semidarkblue"
-    size="sm"
-    href="https://matrix.to/#/#ngipkgs:matrix.org"
-    label="Matrix"
-  />
   <Button
     color="semidarkblue"
     size="sm"
     href="https://github.com/orgs/ngi-nix/projects/8"
-    label="GitHub Project board"
+    label="GitHub project board"
   />
   <Button
     color="semidarkblue"
@@ -106,7 +94,13 @@ import Button from '../../components/ui/Button.astro';
     color="semidarkblue"
     size="sm"
     href="https://github.com/ngi-nix/ngipkgs"
-    label="NGIpkgs"
+    label="NGIpkgs repository"
+  />
+  <Button
+    color="semidarkblue"
+    size="sm"
+    href="https://ngi.nixos.org/"
+    label="NGIpkgs packages"
   />
   <Button
     color="semidarkblue"