Merge branch 'julien4215-game-phases-chart'

Merge pull request lichess-org#512 from lichess-org/improve_home_and_…

…buttons

Improve home and buttons

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Merge pull request lichess-org#420 from lichess-org/issue-template

Add issue template

Tweak tools tab screen

Update fastline

Fix openings link from themes

Simplify websocket

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