feat(docs): add adopter section in doc main page

[wilsonwu]

What type of PR is this?
Add adopter section in main page:

For test, add more adopters data looks like below:

For mobile looks like:

Which issue(s) this PR fixes:
Fixes #2866

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.22%. Comparing base (3f7767f) to head (76ff111).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3466   +/-   ##
=======================================
  Coverage   67.22%   67.22%           
=======================================
  Files         166      166           
  Lines       19722    19722           
=======================================
+ Hits        13258    13259    +1     
  Misses       5507     5507           
+ Partials      957      956    -1     

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[shawnh2]

can we add https://github.com/envoyproxy/gateway/blob/main/ADOPTERS.md#tetrate and https://github.com/envoyproxy/gateway/blob/main/ADOPTERS.md#airspace-link as well?

[wilsonwu]

can we add https://github.com/envoyproxy/gateway/blob/main/ADOPTERS.md#tetrate and https://github.com/envoyproxy/gateway/blob/main/ADOPTERS.md#airspace-link as well?

No problem, I will do it ASAP

[wilsonwu]

Done

[shawnh2]

LGTM！Thanks