Turn off editing for auto-generated index pages, and scroll the user to the right section

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
README.md is a sub-section in how to build automated builds

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
Mention the mkdocs.yml file for adding new documents

and move the complicated discussion about branches lower down,
hopefully most won't need to know

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Merge pull request #8532 from SvenDowideit/demote-readme.md-header

README.md is a sub-section in how to build automated builds
Merge pull request #8530 from SvenDowideit/auto-scroll-to-auto-index-section-the-user-requested

Turn off editing for auto-generated index pages, and scroll the user to the right section
Merge pull request #8462 from SvenDowideit/document-how-to-add-a-new-document

Mention the mkdocs.yml file for adding new documents