doc on using example dashboards and alerts

[david-martin]

Closes Kuadrant/docs.kuadrant.io#73 and Kuadrant/docs.kuadrant.io#66

Short and concise doc to explain about the example dashboards and alerts in the repo and how to make use of them.

A follow up PR to the docs repo will add this to the docs site.

[codecov]

Codecov Report

Merging #562 (6a702a5) into main (ece13e8) will increase coverage by 0.91%.
Report is 48 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #562      +/-   ##
==========================================
+ Coverage   80.20%   81.12%   +0.91%     
==========================================
  Files          64       70       +6     
  Lines        4492     5085     +593     
==========================================
+ Hits         3603     4125     +522     
- Misses        600      656      +56     
- Partials      289      304      +15     

Flag	Coverage Δ
integration	71.89% <ø> (+0.61%)	⬆️
unit	33.08% <ø> (+3.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
api/v1beta1 (u)	71.42% <ø> (ø)
api/v1beta2 (u)	89.24% <100.00%> (-2.19%)	⬇️
pkg/common (u)	83.78% <ø> (-5.05%)	⬇️
pkg/istio (u)	75.14% <ø> (+1.23%)	⬆️
pkg/log (u)	94.73% <ø> (ø)
pkg/reconcilers (u)	∅ <ø> (∅)
pkg/rlptools (u)	79.84% <ø> (+0.39%)	⬆️
controllers (i)	78.67% <84.51%> (+1.87%)	⬆️

see 24 files with indirect coverage changes