feat(tui): change binds for log scrolling and add UI hints

[anthonyshew]

Description

This PR changes the binds for scrolling logs from CTRL+P and CTRL+N to u and d. I'm learning into simple here, both by making the bind a simple one-tap instead of a chord and matching up with the mnemonic device of "up and down".

Minor hesitation

CTRL+n and CTRL+p are familiar to power users of a few terminal tools, but I personally don't see this as a great justification for our tool, which gets used by a much broader audience. I'm erring on the side of simplicity, but happy to hear dissent/pushback/other thoughts.

Additionally, I've updated our UI hints slightly:

• Added the hints for these binds to the logs pane
• Separating binds using spaces instead of commas

Testing Instructions

Pick out your favorite Turborepo and try it out!

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