fix(website): broken .md relative links in docs content files

[ajitpratap0]

Problem

Some markdown content files in the docs directory contain relative links like [CLI Guide](CLI_GUIDE.md) which resolve to 404 pages. They should link to the website doc routes like /docs/cli-guide/.

Broken links found in /docs/getting-started/:

• CLI_GUIDE.md → should be /docs/cli-guide/
• USAGE_GUIDE.md → should be /docs/usage-guide/
• LSP_GUIDE.md → should be /docs/lsp-guide/
• TROUBLESHOOTING.md → no equivalent page yet
• MCP_GUIDE.md → should be /docs/mcp-guide/
• LINTING_RULES.md → should be /docs/linting-rules/
• CONFIGURATION.md → should be /docs/configuration/
• API_REFERENCE.md → should be /docs/api-reference/
• SQL_COMPATIBILITY.md → should be /docs/sql-compatibility/
• ../examples/ → no equivalent page yet

Fix

Audit all markdown files in docs/ for relative .md links and replace with absolute website paths.