docs: adjustments to folder structure

[mowies]

This PR

• fixes some xrefs by moving the source docs in this repo into their respective language folder. This will fix the "view page source" and "edit this page" links on the docs website

[codecov]

Codecov Report

Merging #660 (f7441bb) into main (96170df) will increase coverage by 0.36%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #660      +/-   ##
==========================================
+ Coverage   54.58%   54.95%   +0.36%     
==========================================
  Files          79       79              
  Lines        6533     6584      +51     
==========================================
+ Hits         3566     3618      +52     
  Misses       2816     2816              
+ Partials      151      150       -1     

Impacted Files	Coverage Δ
...ontrollers/lifecycle/keptnevaluation/controller.go	0.00% <0.00%> (ø)
...rs/lifecycle/keptnevaluation/providers/provider.go
.../lifecycle/keptnevaluation/providers/prometheus.go
...s/lifecycle/keptnevaluation/providers/dynatrace.go
...perator/controllers/common/providers/prometheus.go	85.36% <0.00%> (ø)
operator/controllers/common/providers/dynatrace.go	82.53% <0.00%> (ø)
operator/controllers/common/providers/provider.go	100.00% <0.00%> (ø)
...lers/lifecycle/keptnworkloadinstance/controller.go	77.77% <0.00%> (+0.92%)	⬆️
...ptnworkloadinstance/reconcile_prepostdeployment.go	90.90% <0.00%> (+9.09%)	⬆️
...ptnworkloadinstance/reconcile_prepostevaluation.go	90.90% <0.00%> (+9.09%)	⬆️
... and 1 more

Flag	Coverage Δ
component-tests	53.60% <ø> (-0.66%)	⬇️
keptn-cert-manager	67.56% <ø> (ø)
keptn-lifecycle-operator	52.28% <ø> (+0.29%)	⬆️
scheduler	21.17% <ø> (ø)

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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