Migrate to mdoc

[valencik]

Resolves #339
This PR does a pretty naive migration of tut to mdoc.

Some differences in output:

tut

// unbroken text from a String
val cat = Doc.text("cat")
// cat: org.typelevel.paiges.Doc = Doc(...)

// same as text, but using .toString first
val pair = Doc.str((1, 2))
// pair: org.typelevel.paiges.Doc = Doc(...)

mdoc

// unbroken text from a String
val cat = Doc.text("cat")
// cat: Doc = Text(str = "cat")

// same as text, but using .toString first
val pair = Doc.str((1, 2))
// pair: Doc = Text(str = "(1,2)")

It looks like we weren't using the output of tut anywhere in the previous build?
Maybe I am missing something... 🤔

[codecov-io]

Codecov Report

Merging #340 (e1468d5) into master (60cd437) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #340   +/-   ##
=======================================
  Coverage   99.51%   99.51%           
=======================================
  Files           7        7           
  Lines         410      410           
  Branches       41       41           
=======================================
  Hits          408      408           
  Misses          2        2           

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[johnynek]

This is great. We don't use the tut output but we do verify that the examples in the markdown compile. That is the goal for us of using tut/mdoc.

Thanks for doing this!

[ekrich]

Ok, I will rebase later today.