feat: keyboard shortcuts - v2 - nagivation (simple)

[hartmut-co-uk]

note: follow up issue of #39

TODO: plan next steps / shortcuts

Planned navigation shortcuts

• g..h Home
• g..n Notifications
• g..c Conversations
• g..f Favourites
• g..b Bookmarks
• g..e Explore
• g..l Local Timeline
• g..t (Federated) Timeline
• g..i Lists
• g..p Profile
• g..u Go to User (focus on search with '@')

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