feat: add an options page

[nobkd]

Might have to change the trash/remove icon.

Fixes that browser action icon always gets refreshed on dis/enabling of sites.
Adds options page with form and styles and ts functions to match the currently disabled sited.

The default structure for entries in the list is:

<div>
  <span>(sub.)domain.tld</span>
  <button onclick="removeEntry"></button>
</div>

The button is styled to contain the trash icon and removes an entry from the table by getting the index of the div in the table, and removes the domain from the disabled hosts. This works, because the entries in the table always have the same index in the disabledHosts array.