Revert "refine message list spacing"

This reverts commit 8e10831b846cf779a1d0567c632fbaf853021c3e.
Revert "use adwaita icon theme"

This reverts commit f0d4b4c36a774409422248c311d9215ea2e6d395.
Revert "TweetListEntry: Remove custom draw implementation"

This reverts commit d196841c2642b666933e02157f5a84f76ebb8915.
Revert "css: Give each tweet a border-bottom"

This reverts commit 95ef95796d5752ecfc1aca2a473395db6e46a88a.