Add requirements-doc.txt for GitHub Actions

Author: prabha-git

requirements-doc.txt

@@ -0,0 +1,8 @@
+mkdocs>=1.5.0
+mkdocs-material>=9.0.0
+mkdocs-minify-plugin>=0.8.0
+mkdocstrings>=0.25.0
+mkdocs-rss-plugin>=1.12.0
+pymdown-extensions>=10.0
+pillow>=10.0.0
+cairosvg>=2.7.0