docs: update code executor deployment modes description

[pavlochaikivskyi]

Summary

Improved terminology consistency and clarity in Code Executor configuration documentation.

Changes

• Unified terminology: changed "Deployment Options" to "Deployment Modes" throughout the document
• Corrected deployment mode count from three to four modes with explicit namespace options
• Clarified configuration instructions to specify sandbox modes (Same Cluster or Dedicated Cluster) instead of
  ambiguous "any sandbox option"

Testing

• Tested locally with npm start
• All pages render correctly
• Images display properly
• Internal links work
• Sidebar navigation works

Quality Checks

• npm run check passes (typecheck + lint + commitlint)
• No MDX compilation errors
• No raw angle brackets (<text> must be `<text>`)
• Sidebar references document IDs (not filenames)
• Images stored locally next to content (not in static/img/)
• Commit messages follow Conventional Commits
• No secrets or credentials in documentation

Additional Notes

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