docs: rework dokka generation

[utybo]

Dokka isn't great, and documentation display is broken due to how fragile the hack around URLs here. It's probable that I was just doing something stupid, but in the mean time let's switch to Dokkatoo to get some nice(r) docs going on.

Edit: for future reference, I also had to disable "pretty URLs" from Netlify's config because it rewrites /index.html to / and that breaks Dokka/Dokkatoo

Edit2: As a bonus, add access to the Ktor Application instance in KtorApplication and add a proper regression test on OpenAPI stuff

[github-actions]

🚀 Deployed on https://6720191ef1467b0a14c7e26d--transcendent-frangollo-ac6638.netlify.app

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.64%. Comparing base (fa42840) to head (8789461).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
.../zoroark/tegral/web/controllers/KtorApplication.kt	33.33%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #104      +/-   ##
============================================
+ Coverage     89.31%   89.64%   +0.32%     
- Complexity      721      727       +6     
============================================
  Files           200      202       +2     
  Lines          4485     4568      +83     
  Branches        434      441       +7     
============================================
+ Hits           4006     4095      +89     
+ Misses          320      310      -10     
- Partials        159      163       +4     

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