feat(hot-tracks): try list of recent posts sorted by number of reposts

[adrienjoly]

Contributes #718.

What does this PR do / solve?

The current ranking algorithm of hot tracks is complicated and possibly buggy.

Overview of changes

Just show the latest 20 posts that have been reposted at least once.

[adrienjoly]

Before this PR

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
-0.48%	66.67%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (82206c5)	5080	3055	60.14%
Head commit (d513561)	5107 (+27)	3047 (-8)	59.66% (-0.48%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#720)	6	4	66.67%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[adrienjoly]

After this PR