VUU-1118: Auto-generate README from docs

[pling-scottlogic]

Description

Adds a new GitHub action to automatically update the project's README file whenever changes are made to the relevant files in the docs folder. This relevant files are specified in a text file, which supports the use of wildcards.

Change List

• Add bash script to generate README from docs folder
• Add text file to configure which files are included in the resultant README
• Add new GitHub Action run script and commit result

To Do

• Decide what information is to be included in README
• Reorganise docs folder to allow appropriate concatenation
• Update readme_contents.txt to specify relevant docs files/sub-folders
• Replace any reference to README_AUTO.md with README.md
• Drop automatic commit that generated README_AUTO.md

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