About Page Tests

Closes #4508

Tests for:

- Version number is a number
- Database type is an allowed 1 of 3
- There are 20 contributors
- First contributor has an image tag and image src exists, alt tag, title tag, href to github
I, personally, would change this regex to use `\d+` rather than `\d{1,2}` as this will match versions with any number of digits between the dots (We might realistically release 0.5.100). Also, you can move `js-version-number` onto the existing span rather than adding a new one, as this regex checks that the `versionNumber` contains a match, rather than that it is a 100% match - it can have things at the beginning and end like `v0.5.6-beta` and because it has 0.5.6 in the middle it will match, which is good :)