Tidy workflow

Author: gchqdev56268

.github/workflows/documentation.yaml

@@ -1,4 +1,4 @@
-name: Pages
+name: Deploy Documentation
 on:
   push:
     branches:
@@ -11,13 +11,9 @@ jobs:
         uses: actions/checkout@master
         with:
           fetch-depth: 0 # otherwise, you will failed to push refs to dest repo
-      - name: Update docs
-        run: |
-          pip install .
-          pip install sphinx sphinx-rtd-theme
-          cd doc
-          make html
-      - name: Build and Commit
+      - name: Install ANNchor from git
+        run: pip install .
+      - name: Build and Commit docs
         uses: sphinx-notes/pages@master
         with:
           documentation_path: doc