docs(ci): Netlify ignore command to check branch (#2659)

Add a separate ignore script that checks git changes but also
only deploys main and version branches to allow us to deploy
versioned docs.

Co-authored-by: Cem Aksoylar <caksoylar@users.noreply.github.com>

docs/netlify.toml

@@ -1,5 +1,5 @@
 [build]
-  ignore = "git diff --quiet $CACHED_COMMIT_REF $COMMIT_REF . ../app/boards/"
+  ignore = "bash ./netlify-ignore-command.sh"
 
 [[redirects]]
   from = "/community/discord/invite"