feat: add several new shortcut keys for navigation

[shuuji3]

This PR implements most of the navigation shortcuts in #1855.

Before

After

These had already been implemented:

• g+h - Home
• g+n - Notifications

New shortcuts by this PR:

• 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
• / - Search (this is listed in feat: keyboard shortcuts - v3 - actions #1856).

Remaining:

• g+u - Go to User (focus on search with '@')

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[patak-dev]

Sweet!

[shuuji3]

Forgot to mention that the "g+c - Conversations" is currently overridden by c (compose): https://github.com/elk-zone/elk/pull/2618/files#diff-056fa2fefde5dfe10f592f8bd1407e39e7a9347261dcad084fea60d2eae03e9cR42-R43 (though sometimes works due to the current issue we found in #2612).

To fix this, we'll need to find a way to avoid activating c when the first key (g) has already been typed.

[joelanman]

might this have caused this issue?
#2628