Removed useless link + fixed some css/js paths

[corpsee]

Contribution Type: cosmetic Link to Intent to Implement: - Link to Bug: -

This pull request affects the following areas:

• [X] Front-End
• [ ] Builder
• [ ] Build Plugins

In raising this pull request, I confirm the following (please check boxes):

• [X] I have read and understood the contributing guidelines?
• [X] I have checked that another pull request for this purpose does not exist.
• [X] I have considered, and confirmed that this submission will be valuable to others.
• [X] I have created or updated the relevant documentation for this change on the PHPCI Wiki.
• [X] Do the PHPCI tests pass?

Detailed description of change: Removed useless link + fixed some css/js paths

[dancryer]

As @Shade634 mentioned, a lot of people were not keen on there being externals here. I'd suggest we should be looking at removing all externals rather than adding new ones.