docs: link community/contributing from dev

Link <https://lima-vm.io/docs/community/contributing/>
from <https://lima-vm.io/docs/dev/>.

Close issue 3792

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

Author: AkihiroSuda

website/content/en/docs/dev/_index.md

@@ -2,3 +2,8 @@
 title: Developers' guide
 weight: 500
 ---
+
+This section provides technological resources for developers of Lima.
+
+See also [`Community`](../community) » [`Contributing`](../community/contributing)
+for how to contribute to the project.