fix: set upstream in sync handler, cleanup docs around setting up github

docs/setting up your GitHub repository.md

@@ -12,10 +12,14 @@ At the top of your repository on GitHub.com's Quick Setup page, click the clipb
 
 ![[github-quick-setup.png]]
 
-In your terminal of choice, navigate to the root of your Quartz folder. Then, run the following command, replacing `REMOTE-URL` with the URL you just copied from the previous step.
+In your terminal of choice, navigate to the root of your Quartz folder. Then, run the following commands, replacing `REMOTE-URL` with the URL you just copied from the previous step.
 
 ```bash
+# add your repository
 git remote add origin REMOTE-URL
+
+# track the main quartz repository for updates
+git remote add upstream https://github.com/jackyzha0/quartz.git
 ```
 
 To verify that you set the remote URL correctly, run the following command.

quartz/cli/handlers.js

@@ -528,7 +528,7 @@ export async function handleSync(argv) {
   await popContentFolder(contentFolder)
   if (argv.push) {
     console.log("Pushing your changes")
-    const res = spawnSync("git", ["push", "-f", ORIGIN_NAME, QUARTZ_SOURCE_BRANCH], {
+    const res = spawnSync("git", ["push", "-uf", ORIGIN_NAME, QUARTZ_SOURCE_BRANCH], {
       stdio: "inherit",
     })
     if (res.status !== 0) {