Call dynamic-readme reusable workflow (#2550)

We want to have a way to edit our README footer at one place and have
the changes from there be propagated to our repos.

By adding this snippet in the README, we call this reusable workflow:
https://github.com/thoughtbot/templates/blob/main/.github/workflows/dynamic-readme.yaml
that renders the README footer dynamically.

.github/workflows/dynamic-readme.yml

@@ -0,0 +1,19 @@
+name: update-templates
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - README.md
+  workflow_dispatch:
+
+jobs:
+  update-templates:
+    permissions:
+      contents: write
+      pull-requests: write
+      pages: write
+    uses: thoughtbot/templates/.github/workflows/dynamic-readme.yaml@main
+    secrets:
+      token: ${{ secrets.GITHUB_TOKEN }}

README.md

@@ -68,20 +68,9 @@ community](https://github.com/thoughtbot/administrate/graphs/contributors).
 
 ## License
 
-administrate is Copyright © 2015-2024 thoughtbot.
+administrate is Copyright © 2015 thoughtbot.
 It is free software, and may be redistributed under the terms specified in the
 [LICENSE](/LICENSE.md) file.
 
-## About thoughtbot
-
-![thoughtbot](https://thoughtbot.com/brand_assets/93:44.svg)
-
-administrate is maintained and funded by thoughtbot, inc.
-The names and logos for thoughtbot are trademarks of thoughtbot, inc.
-
-We love open source software!
-See [our other projects][community] or
-[hire us][hire] to design, develop, and grow your product.
-
-[community]: https://thoughtbot.com/community?utm_source=github
-[hire]: https://thoughtbot.com?utm_source=github
+<!-- START /templates/footer.md -->
+<!-- END /templates/footer.md -->