site: Add docs for header manipualtion with Ingress

[sunjayBhatia]

Fixes: #4102

[codecov]

Codecov Report

Merging #4279 (d30da37) into main (81dd7c9) will increase coverage by 0.06%.
The diff coverage is 63.63%.

❗ Current head d30da37 differs from pull request most recent head f1eaca4. Consider uploading reports for the commit f1eaca4 to get more accurate results

@@            Coverage Diff             @@
##             main    #4279      +/-   ##
==========================================
+ Coverage   77.74%   77.80%   +0.06%     
==========================================
  Files         112      112              
  Lines       10014    10022       +8     
==========================================
+ Hits         7785     7798      +13     
+ Misses       2046     2042       -4     
+ Partials      183      182       -1     

Impacted Files	Coverage Δ
internal/certgen/certgen.go	71.73% <0.00%> (-1.60%)	⬇️
internal/annotation/annotations.go	100.00% <100.00%> (ø)
internal/dag/ingress_processor.go	97.53% <100.00%> (+4.32%)	⬆️
internal/k8s/objectmeta.go	93.75% <100.00%> (+0.89%)	⬆️

[skriss]

Changes LGTM, however while reviewing I couldn't find a link to this page in the TOC - am I missing it? If it's not there, we should add, otherwise I'm not sure how folks find this page.

[sunjayBhatia]

Changes LGTM, however while reviewing I couldn't find a link to this page in the TOC - am I missing it? If it's not there, we should add, otherwise I'm not sure how folks find this page.

no i think i forgot to add it when i added this page, adding now

see https://deploy-preview-4279--projectcontour.netlify.app/docs/main/

[skriss]

LGTM

[skriss]

Looks like this page needs an update for recently-merged #4271 too, I'll put a PR up for that.