Front matter is the header of the document, between two sets of ---.
- exclude_from_nav: if true, current page will be excluded from main navigation tree
- exclude_nav: if true, current page won't show main navigation tree
- parent: url of a direct ancestor should be put here, starting with /docs/
- nav_order: order in main navigation tree, lower is higher
- no_troubleshooting: if true, the page won't render FAQ (troubleshooting) section
- search_exclude: if true, page won't be in search results