Docs/service basics

[piksel]

Bulk update of documentation, adding the auto-generated config field info and various other fixes.

[codecov]

Codecov Report

Merging #167 (04213d0) into main (2e5982c) will decrease coverage by 1.39%.
The diff coverage is 12.79%.

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
- Coverage   64.48%   63.08%   -1.40%     
==========================================
  Files          79       79              
  Lines        2427     2487      +60     
==========================================
+ Hits         1565     1569       +4     
- Misses        724      780      +56     
  Partials      138      138              

Impacted Files	Coverage Δ
pkg/format/field_info.go	64.44% <0.00%> (-4.61%)	⬇️
pkg/format/render_console.go	35.52% <0.00%> (-3.05%)	⬇️
pkg/format/render_markdown.go	0.00% <0.00%> (ø)
pkg/format/urlpart.go	0.00% <0.00%> (ø)
pkg/services/discord/discord_config.go	82.35% <ø> (ø)
pkg/services/gotify/gotify_config.go	88.23% <ø> (ø)
pkg/services/ifttt/ifttt_config.go	84.00% <ø> (ø)
pkg/services/join/join_config.go	80.00% <ø> (ø)
pkg/services/mattermost/mattermost_config.go	50.00% <0.00%> (-8.83%)	⬇️
pkg/services/opsgenie/opsgenie_config.go	85.71% <ø> (ø)
... and 8 more

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