Update workflow

Use requirements.txt to install dependencies
Remove git-authors plugin

Author: santaimpersonator

.github/workflows/build_documentation.yml

@@ -34,7 +34,7 @@ jobs:
           python-version: 3.x
 
       - name: Install Python dependencies
-        run: pip install mkdocs-monorepo-plugin mkdocs-redirects mkdocs-git-authors-plugin mkdocs-git-revision-date-localized-plugin mkdocs-git-committers-plugin-2 Pillow 'mkdocs-material[imaging]'
+        run: pip install -r requirements.txt
 
       - name: Set up build cache
         run: echo "cache_id=$(date --utc '+%V')" >> $GITHUB_ENV

requirements.txt

@@ -0,0 +1,5 @@
+mkdocs-monorepo-plugin
+mkdocs-redirects
+mkdocs-git-revision-date-localized-plugin
+mkdocs-git-committers-plugin-2
+Pillow