chore: Delete old docs for package hosts (#908)

Fixing remnants that were not deleted in the previous PR.

#724

Author: varungandhi-src

docs/admin/code_hosts/go.mdx

@@ -72,9 +72,3 @@ Sourcegraph supports internal rate limit configuration for the following connect
 - [Bitbucket Cloud](/admin/code_hosts/bitbucket_cloud#rateLimit)
 - [Bitbucket Server](/admin/code_hosts/bitbucket_server#rateLimit)
 - [Perforce](/admin/repo/perforce#rateLimit)
-- [Go Modules](/admin/code_hosts/go#rateLimit)
-- [JVM Packages](/admin/code_hosts/jvm#rateLimit)
-- [NPM Packages](/admin/code_hosts/npm#rateLimit)
-- [Python Packages](/admin/code_hosts/python#rateLimit)
-- [Ruby Packages](/admin/code_hosts/ruby#rateLimit)
-- [Rust Packages](/admin/code_hosts/rust#rateLimit)