docs: added permalink description to supported frontmatter doc (#1369)
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| | | - `title`: Title of the page. If it isn't provided, Quartz will use the name of the file as the title. |
| | | - `description`: Description of the page used for link previews. |
| | | - `permalink`: A custom URL for the page that will remain constant even if the path to the file changes. |
| | | - `aliases`: Other names for this note. This is a list of strings. |
| | | - `tags`: Tags for this note. |
| | | - `draft`: Whether to publish the page or not. This is one way to make [[private pages|pages private]] in Quartz. |