Add keyboard shortcuts.

[meisterT]

This is just draft code to demonstrate possible behavior and gauge interest.

Go to a single submission, and try typing j or k to move to the next or previous submission. This also works on all other pages that end with a number.

Also, try typing s followed by a sequence of digits and Enter, e.g. s123<Enter>, it will navigate to the submission page with the submission 123.

Let me know if something like this is interesting.

TODO:

• We want to restrict this to the jury pages.
• Potentially add an option to disable it.
• If we add it, we could add other shortcuts, e.g. t42 goes to team 42, etc.
• Unfortunately, j is both the natural next key as well as the natural key for judgings.
• I am not sure whether I always reset things correctly.
• We probably want to add Shift + ? to display a keyboard shortcut help box.
• Other keyboard shortcuts, e.g. to access source code quickly, are trivial to add.

[meisterT]

This is the current list of keyboard shortcuts

We probably want to add it the manual once we settled on it.