chore: Update redirecting URLs to canonical destinations (#2482)

## Summary

- Replaces `docs.cloudquery.io` (old subdomain) with `www.cloudquery.io` in CONTRIBUTING.md
- Replaces `cli-docs.cloudquery.io` (old subdomain) with `www.cloudquery.io/docs` in CONTRIBUTING.md
- Replaces `/plugins` (redirecting path) with `/hub/plugins/source` in README.md

These URLs were flagged as redirect chains. All three now point directly to canonical destinations.

## Test plan

- [x] Verify https://www.cloudquery.io loads correctly
- [x] Verify https://www.cloudquery.io/docs loads correctly
- [x] Verify https://www.cloudquery.io/hub/plugins/source loads correctly

Author: JoeKarlsson

CONTRIBUTING.md

@@ -7,8 +7,8 @@ This is the repository for CloudQuery SDK. If you are looking for CloudQuery CLI
 ## Links
 
 - [Homepage](https://cloudquery.io)
-- [Platform](https://docs.cloudquery.io)
-- [Documentation](https://cli-docs.cloudquery.io)
+- [Platform](https://www.cloudquery.io)
+- [Documentation](https://www.cloudquery.io/docs)
 - [CLI and Plugins Monorepo](https://github.com/cloudquery/cloudquery)
 - [Community](https://community.cloudquery.io)
 

README.md

@@ -21,6 +21,6 @@ The plugin SDK is imported as a dependency by CloudQuery plugins. When starting
 
 ## Supported plugins
 
-<https://www.cloudquery.io/plugins>
+<https://www.cloudquery.io/hub/plugins/source>
 
 If you want us to add a new plugin or resource please open an [Issue](https://github.com/cloudquery/cloudquery/issues).