docs: Add gateway API link, fix Contour plugin naming

[todaywasawesome]

The format for the plugin names shouldn't just be what the git repo name is, it should be the plugin name so I updated that as well.

Checklist:

• [c] Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• [b] The title of the PR is (a) conventional with a list of types and scopes found here, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• [y] I've signed my commits with DCO
• [n] I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• [y] My builds are green. Try syncing with master if they are not.
• [y] My organization is added to USERS.md.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (497e69a) 81.64% compared to head (a5440a9) 81.64%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2787   +/-   ##
=======================================
  Coverage   81.64%   81.64%           
=======================================
  Files         133      133           
  Lines       20178    20178           
=======================================
  Hits        16475    16475           
  Misses       2849     2849           
  Partials      854      854           

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[github-actions]

Go Published Test Results

1 952 tests   1 952 ✔️  2m 36s ⏱️
   118 suites         0 💤
       1 files           0 ❌

Results for commit a5440a9.

[github-actions]

E2E Tests Published Test Results

    4 files      4 suites   3h 32m 24s ⏱️
  96 tests   84 ✔️   5 💤   7 ❌
396 runs  364 ✔️ 20 💤 12 ❌

For more details on these failures, see this check.

Results for commit a5440a9.