Improve settings page usability

[diosmosis]

trafficstars

There are a lot of settings in Matomo for WordPress, all spread out across seven tabs. All of these settings are not categorized beyond the tab, have very little context (the default help is hidden), and many are not particularly user friendly to non-developers (for example, values needing to be separated by '|').

Some ideas to increase usability:

• Always show the help text instead of requiring a toggle (as is done in Matomo settings screens). This allows the help text to be searchable as well. (Mostly applies to Tracking settings.)
• Use better controls for some settings, for example, multiple inputs for array values.
• Allow searching for settings by keyword across tabs.
• Organize settings by categories and order by how likely it is a user will want to know of them.
• Make blocks of text more readable and useful by focusing on what users will and may want to do in the relevant section. (re Privacy & Gdpr).

[diosmosis]

We could also avoid using tabs altogether and instead use collapsible sections: