Mastodon: Higher-contrast accessibility option

[citizenk]

As noted on this toot, Mastodon's default style is not accessible to all. There are technical work-arounds (userstyles and such), but they may imply the help from other people or a certain technical knowledge to be useful.

An option to a higher-contrast, higher-visible interface would be nice, especially if offered from the get-go through the welcome screens.

Reference: https://computerfairi.es/users/maunzikation/updates/2884

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• [ * ] I searched or browsed the repo’s other issues to ensure this is not a duplicate.

[wxcafe]

This should definitely be added in when there's a theme engine available (see #2028)

[expenses]

This could be added with #1587 too.

[nevillepark]

Reviving this thread to note that in the default theme, the text "Information below may reflect the user's profile incompletely. View full profile" is still too low-contrast.

[Gargron]

High contrast theme has been added recently in #7213