try generating markdown

[Nilstrieb]

this is WIP but its looking interesting already

the idea: we keep the current code snippets, additionally we add expalnations in explanations/unsafe_1.md which also contain the titles, then we assemble all of the explanations and code samples+stderr together to make something great. we match the file name for it.

the current implementation needs to be improved and stuff needs to be ported.

[WaffleLapkin]

Can we put explanations and code in the same directory?

The current structure is somewhat annoying is that the explanation and code live so far apart.

• They are lonely
• It's harder than necessary to write explanations, because switching to code is inconvenient

imo we could have whatever_directory/unsafe_1.rs + whatever_directory/unsafe_1.md (or, even better, dir/unsafe/_1.rs and dir/unsafe/1.md, although I'm not sure how to setup the rust projects to allow unsafe/_1.rs...).