Fixes part of #4194: Added dark mode support to RevisionCardActivity and HomeActivity

[bhaktideshmukh]

Explanation

This PR covers two parts of #4194 -- RevisionCardActivity and HomeActivity

Mocks link:--

• HomeActivity -- https://xd.adobe.com/view/c05e9343-60f6-4c11-84ac-c756b75b940f-950d/screen/d47aa8de-a7a8-4d25-b011-5baefc7b7098/specs/
• RevisionCardActivity -- https://xd.adobe.com/view/c05e9343-60f6-4c11-84ac-c756b75b940f-950d/screen/1adacef0-f245-4115-a0e0-d1c2e7d5a0bb/specs/

Screenshots

Default	Dark mode

Default	Dark mode

Essential Checklist

• The PR title and explanation each start with "Fix #bugnum: " (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• Any changes to scripts/assets files have their rationale included in the PR explanation.
• The PR follows the style guide.
• The PR does not contain any unnecessary code changes from Android Studio (reference).
• The PR is made from a branch that's not called "develop" and is up-to-date with "develop".
• The PR is assigned to the appropriate reviewers (reference).

For UI-specific PRs only

If your PR includes UI-related changes, then:

• Add screenshots for portrait/landscape for both a tablet & phone of the before & after UI changes
• For the screenshots above, include both English and pseudo-localized (RTL) screenshots (see RTL guide)
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[rt4914]

@bhaktideshmukh Suggested changes. Also, merge with latest develop.

[rt4914]

@bhaktideshmukh Also, file a separate issue for Promoted Story Cards- DarkMode so that we can discuss with designers about its design.

[oppiabot]

Hi @bhaktideshmukh, I'm going to mark this PR as stale because it hasn't had any updates for 7 days. If no further activity occurs within 7 days, it will be automatically closed so that others can take up the issue.
If you are still working on this PR, please make a follow-up commit within 3 days (and submit it for review, if applicable). Please also let us know if you are stuck so we can help you!

[bhaktideshmukh]

@bhaktideshmukh Also, file a separate issue for Promoted Story Cards- DarkMode so that we can discuss with designers about its design.

Done.
#4600

[rt4914]

LGTM, Thanks.

[rt4914]

Stuck on some flaky tests. Restarted

[BenHenning]

Thanks @bhaktideshmukh. Took a review pass as well, and didn't spot anything else. Since Rajat already reviewed and his latest comment is addressed (tests are no longer failing in CI), going ahead and merging this.