Puzzles and minor improvements

[PeterNerlich]

Seven years.

A few weeks less than seven years ago, my journey into university stuff and committee work started. For one year I soaked up the ideas and all the enthusiasm by the ifsr. Six years I was active in "my own" student council, trying to make cool stuff and shape a good undergrad experience. Getting the MANUAL to Görlitz and giving it as much momentum as possible is a strong contender for the biggest achievement in these six years.

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This PR has not that much at all to contribute back. I overlooked \fancypageref when creating the macros.tex and slapped the pdfx package on in order to get PDF/A (for archival) out, whithout actually knowing anything about how these standards work and whether it actually successfully generates a conforming PDF.

The biggest change if you look at the diff is the puzzles. I wanted to have puzzles. I made puzzles. The picross one is simple, the network one is, too – but being printed and non-interactive, it might be too confusing and complicated to keep track of the simulation in your head, especially when you don't already have a programmers mindset when starting your studies. On the flipside it should be 100% original.

[PeterNerlich]

The quote is very stupid and has no context, I can take it out if you don't want it in your manual 😅

[Feliix42]

Hi Peter! It's good to hear from you again! Thank you for your continued commitment to the NoPanic/Manual and the @fsr :)

I'm not in charge of the project anymore but I'm sure your contributions will be welcomed and maybe also merged before the next ESE 😄