CI: Only update docs when docs actually change (#23)

.github/workflows/build_docs.yml

@@ -1,10 +1,12 @@
 name: Website Upload
 on:
   push:
+    paths:
+      - '.github/workflows/docs.yml'
+      - 'docs/**'
     # We only run this GitHub action upon new commits to `main`
     branches:
       - main
-      - initialdocs # Temporary branch for initial documentation
 jobs:
   build-and-deploy:
     runs-on: ubuntu-latest
@@ -34,4 +36,4 @@ jobs:
           # Do not remove the `.nojekyll` file: we have manually added an empty `.nojekyll` file at the root of the `gh-pages` branch and we don't want having to re-create it after each build.
           clean-exclude: |
             .nojekyll
-            CNAME
+            CNAME