Hotkey navigation for non-interactive terminals

[samc]

Description

This is in response to both #31 & #59. I currently use WSL and use the Windows Terminal Preview as my daily driver. Unfortunately it is non-interactive, so mouse based events do not work for the blessed element selection. This makes selecting the Logs element impossible.

Could very easily expand on the navigation via some combination of cardinal selection via CTRL+SHIFT+[LEFT, RIGHT, UP, DOWN].

Implemented

• Added keybind i to focus Pods element.
• Added keybind p to focus Logs element.
• Implemented border highlight to indicate focused element.
• Added README instructions for above keybinds.

[astefanutti]

Let me close this as it's superseded by #104.