Disable on Master branch

[tomjn]

Tells users to switch to the stable branch and gives them the commands to do so.

This should avoid users being stuck on VVV v3.9.1 without updates and bug fixes, and us maintaining a duplicate of the stable branch

Checks

• [x] I've tested this PR
• [x] This PR is complete and ready for review.

[update-docs[bot]]

Thanks for opening this pull request! Make sure CHANGELOG.md gets updated with this change, additionally any docs that need updated can be found at https://github.com/Varying-Vagrant-Vagrants/varyingvagrantvagrants.org

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[tomjn]

[tomjn]

Simpler message:

[tomjn]

Separated the commands as && doesn't work well on Windows: