Updates the "Last updated" date and clarifies the description
of the Command Palette within GitKraken Desktop documentation.

Removes redundant or outdated sections from the documentation, improving clarity and relevance for users.
This change streamlines the documentation by removing information that is no longer accurate or necessary.

Removes the separate "How to Install" document, likely due to redundancy or integration of the information elsewhere.
Also removes the "Copy Issue Link or View in GitHub" section from the GitHub issues documentation page, as the functionality may no longer exist or has been moved.