Missing dashboard message

[tomjn]

If a user deletes the entire www folder and the dashboard with it there'll be no www/default/index.php loader file and Nginx will show a forbidden HTTP error when visiting vvv.test.

Instead it now shows this:

Making it clear what happened and suggesting a solution.

Checks

• [x] I've updated the changelog.
• [x] I've tested this PR
• [x] This PR is for the develop branch not the stable branch.
• [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]

I was able to test this by renaming index.php and visiting the dashboard