Remotely hosted code restrictions

https://developer.chrome.com/docs/extensions/mv3/intro/mv3-migration/#remotely-hosted-code

The options.js is currently pulling Bootstrap CSS remotely - this needs to be moved into the extension.

• https://gitlab.com/gitlab-com/support/toolbox/zd-dl-router/-/blob/v3.0.0/source/options.html#L8