Enhance the README

README.md

@@ -1,8 +1,10 @@
 # The Invidious documentation
 
-# Running the documentation locally for development purposes
+## Running the documentation locally for development purposes
 
-## Local `mkdocs-material` installation
+Run those commands in the repository's folder.
+
+### Local `mkdocs-material` installation
 
 ```bash
 # You might want to create a virtualenv first
@@ -10,7 +12,7 @@ pip install mkdocs-material
 mkdocs-material serve
 ```
 
-## With docker
+### With docker
 
 ```bash
 docker run --rm -it -p 8000:8000 -v ${PWD}:/docs squidfunk/mkdocs-material:latest