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

[craciunoiuc]

Hey @teodoradriann, are you up for some more rounds of reviews or do you want me to take over this PR to get it to shape?

Let me know how your availability is looking

Edit: I pushed my fixes (hopefully ok with you)