3025: Fix SETUP generating invalid files. r=mergify[bot] a=Diman0
## What type of PR?
bug-fix
## What does this PR do?
If JavaScript script is disabled or JS files are blocked from the setup website, the SETUP website would generate invalid configuration. Checks were added to prevent this situation from occurring.
Bootstrap loaded an outdated jquery version 1. We already use Jquery 2. I have disabled this and configured bootstrap to load our jquery js file.
Also fixed a regular expression that makes sure the specified Mailu storage path is valid.
### Related issue(s)
- closes#2396
- closes#2890
- closes#1524
## Prerequisites
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.
- [n/a] In case of feature or enhancement: documentation updated accordingly
- [x] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/workflow.html#changelog) entry file.
Co-authored-by: Dimitri Huisman <diman@huisman.xyz>
Co-authored-by: Dimitri Huisman <52963853+Diman0@users.noreply.github.com>
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