docs: Add comprehensive custom certificate authority guide

Rohan Satkarrequested to merge
Coderxrohan/gitlab-vscode-extension:docs-custom-ca-configuration into main

What does this MR do?

Adds comprehensive documentation for configuring custom Certificate Authority in enterprise environments.

Why was this MR needed?

Users in controlled enterprise environments were experiencing certificate validation issues. The documentation clarifies:

  • The importance of downloading the full certificate chain (not individual certificates)
  • Multiple configuration methods (system store, custom file, settings)
  • Platform-specific instructions (Windows, macOS, Linux)
  • Troubleshooting common certificate errors
  • Enterprise scenarios (proxy SSL inspection, internal CAs, multiple instances)

Related issues

Closes #2081 (closed) Related to #2077

Documentation changes

  • Added docs/user/custom-certificates.md with comprehensive guide
  • Follows GitLab documentation style guide with proper front matter
  • Placed alongside other user documentation in docs/user/ folder

Author checklist

  • Documentation follows GitLab style guide
  • Cross-platform instructions included
  • Troubleshooting section covers common issues
  • Links to additional resources provided
  • Proper front matter for documentation structure

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