docs: improve first-time git setup

docs/authoring content.md

@@ -28,21 +28,13 @@ The rest of your content lives here. You can use **Markdown** here :)
 Some common frontmatter fields that are natively supported by Quartz:
 
 - `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.
 - `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.
 - `date`: A string representing the day the note was published. Normally uses `YYYY-MM-DD` format.
 
 ## Syncing your Content
 
-When your Quartz is at a point you're happy with, you can save your changes to GitHub by doing `npx quartz sync`.
-
-> [!hint] Flags and options
-> For full help options, you can run `npx quartz sync --help`.
->
-> Most of these have sensible defaults but you can override them if you have a custom setup:
->
-> - `-d` or `--directory`: the content folder. This is normally just `content`
-> - `-v` or `--verbose`: print out extra logging information
-> - `--commit` or `--no-commit`: whether to make a `git` commit for your changes
-> - `--push` or `--no-push`: whether to push updates to your GitHub fork of Quartz
-> - `--pull` or `--no-pull`: whether to try and pull in any updates from your GitHub fork (i.e. from other devices) before pushing
+When your Quartz is at a point you're happy with, you can save your changes to GitHub.
+First, make sure you've [[setting up your GitHub repository|already setup your GitHub repository]] and then do `npx quartz sync`.