feat(tools): Introduce tool to generate man pages

[teodoradriann]

Prerequisite checklist

• Read the contribution guidelines regarding submitting new changes to the project;
• Tested your changes against relevant architectures and platforms;
• Ran make fmt on your commit series before opening this PR;
• Updated relevant documentation.

Description of changes

I updated the auto-generating documentation script located at tools/gendocs/main.go by adding two new functionalities.

Now, after compiling the program, you can use one of the following flags:
• --man or -m: Automatically generates all KraftKit documentation as .1 files, located in kraftkit/doc/man.
• --install or -i: Installs all the files found in the man folder system-wide and updates the mandb.

GitHub-Closes: #1704

[craciunoiuc]

Nice, thanks for this @teodoradriann

Some initial mentions from me:

1. Can you squash your commits and tidy them up? I think 1-2 commits are fine for this use case. I edited your PR title, I guess you can use that one also.
2. Can you move your changes from gendocs to a separate tools/genman/main.go. The gendocs tool is used for the website to generate things in a certain format. Just copy your things to the separate file and delete everything gendocs-related.
3. Add some pictures with the result to the PR description.

That's all from my side, after this is done I'll leave some code comments also

[teodoradriann]

Okay, will do and update