fix: improve multi-arch docs

[gsquared94]

This PR updates some text and adds a diagram to http://34.170.244.219:1313/docs/workflows/handling-platforms/

[container-tools-bot]

Please visit http://34.170.244.219:1313 to view changes to the docs.

[codecov]

Codecov Report

Merging #7767 (3485f68) into main (290280e) will decrease coverage by 3.93%.
The diff coverage is 53.59%.

@@            Coverage Diff             @@
##             main    #7767      +/-   ##
==========================================
- Coverage   70.48%   66.54%   -3.94%     
==========================================
  Files         515      589      +74     
  Lines       23150    28356    +5206     
==========================================
+ Hits        16317    18870    +2553     
- Misses       5776     8111    +2335     
- Partials     1057     1375     +318     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/credits/export.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/deploy.go	40.90% <0.00%> (-12.94%)	⬇️
cmd/skaffold/app/cmd/test.go	44.44% <0.00%> (ø)
cmd/skaffold/skaffold.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/inspect_tests.go	62.50% <14.28%> (-1.14%)	⬇️
cmd/skaffold/app/cmd/render.go	35.48% <18.18%> (-5.90%)	⬇️
cmd/skaffold/app/cmd/lsp.go	28.12% <28.12%> (ø)
cmd/skaffold/app/cmd/run.go	64.28% <33.33%> (-9.63%)	⬇️
cmd/skaffold/app/cmd/fix.go	56.41% <37.50%> (-20.07%)	⬇️
cmd/skaffold/app/cmd/verify.go	41.17% <41.17%> (ø)
... and 351 more

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