feature request: Keyboard navigation

[zealain]

Checklist

• I checked that this feature has not been requested before
• I checked that this feature is not in the "Not planned" list
• This feature will benefit the majority of users

Problem Description / Use Case

You might not always be sitting at your desk when watching anime, but instead be on the couch for example, where access to a mouse is less convenient. Access to a keyboard is much easier, for example through a remote or game controller. At the moment, I don't see a way to properly navigate the site with such devices.

Proposed Solution

Most remotes/controllers can act as keyboards, so keyboard navigation seems like the most general purpose solution. Making everything usable with keyboard only might be a larger undertaking, but at least the basic actions for everyday use like navigating the library and starting playback should be feasible. That would roughly include:

• Selecting a "tab" (My Library, Schedule, etc.)
• Selecting an entry from the library
• Selecting an episode
• Starting playback

[5rahim]

Most of the web interface follows ARIA so it can be navigated using Tab and Shift+Tab. Admittedly, right now you can't really select episodes, and navigating the library isn't intuitive, so I can improve that aspect.
Not sure about remote/controller navigation since I can't test it on my own but I'll see what I can do.