⬇️ feat: desktop entry & manpage installation through `linutil-installer.sh`

[adamperkowski]

Type of Change

• [x] New feature
• [x] UI/UX improvement

Checklist

• [x] My code adheres to the coding and style guidelines of the project.
• [x] I have performed a self-review of my own code.
• [x] My changes generate no errors/warnings/merge conflicts.

[lj3954]

The include_dir crate appears to resolve symlinks. Instead of downloading these files from the internet, we can include them in the binary, by symlinking them into some directory the script can access.

[adamperkowski]

The include_dir crate appears to resolve symlinks. Instead of downloading these files from the internet, we can include them in the binary, by symlinking them into some directory the script can access.

I know. Do we want to though? linutil-installer.sh already needs internet connection for its functionality.