dev: auto-add issues to project board

With this we can slowly transition away from the unhelpful deluge of
Github status labels.

Ref: https://github.com/orgs/doomemacs/projects/2/views/1

.github/workflows/add-to-project.yml

@@ -0,0 +1,17 @@
+name: Add issues to project
+
+on:
+  issues:
+    types:
+      - opened
+
+jobs:
+  add-to-project:
+    name: Add issue to project
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/add-to-project@main
+        with:
+          project-url: https://github.com/orgs/doomemacs/projects/2
+          github-token: ${{ github.token }}
+          labeled: needs-triage