[harmony] Bug 1983391: Add a donation banner to the home page

[justdave]

Details

Adds a donation banner to the front page, per the specification in Bug 1983391 comment 3

Light mode:

Dark mode:

The "call to action" message at the top is randomly picked from the following list:

use constant BANNER_MESSAGES => (
  'Help us make Bugzilla better more often.',
  'A small donation helps keep Bugzilla moving forward.',
  'Support the people who keep Bugzilla running.',
  'Even a little funding helps Bugzilla improve more quickly.',
  'If Bugzilla helps your team, consider helping Bugzilla too.',
);

I'm open to suggestion for messaging in there.
It could use a real graphic on the left, too. Buggie holding a wad of cash? @hellcp

The administrative params screen linked to in the bottom of that banner:

The end-user preferences screen:

Additional info

• bug#1983391

Test Plan

1. Fired up Bugzilla using the docker image, and played around.

[dannycolin]

No strong feeling if we keep the current list of options but it might be better to have less. For example,

• Remind me later (default: 1 month)
• Pick a date...
• Never...

Feel free to file a follow-up bug to explore this option if you consider it low priority for the next release ;)

[dannycolin]

In dark mode, the contrast ratio is too low. We have two options:

1. Use --accent-color-lightgreen-1 for the border and background color
2. Use --accent-color-green-1 with color: #000 !important

I, personally, find option 1 more aesthitically more pleasing.

[dannycolin]

When the date is non-specific, we should disable the datepicked to remove any confusion.