Use cloud.zed.dev for install.sh (#42399)

Similar to #42246, we'd like to avoid having Vercel on the critical
path.

https://zed.dev/install.sh is served from Cloudflare by intercepting a
route on that page, so this makes the shell-based install flow vercel independent.

Release Notes:

- `./script/install.sh` will now fetch assets via
`https://cloud.zed.dev/`
instead of `https://zed.dev`. As before it will redirect to GitHub
releases
  to complete the download.

docs/src/linux.md

@@ -72,9 +72,10 @@ If you'd prefer, you can install Zed by downloading our pre-built .tar.gz. This
 
 Download the `.tar.gz` file:
 
-- [zed-linux-x86_64.tar.gz](https://zed.dev/api/releases/stable/latest/zed-linux-x86_64.tar.gz) ([preview](https://zed.dev/api/releases/preview/latest/zed-linux-x86_64.tar.gz))
-- [zed-linux-aarch64.tar.gz](https://zed.dev/api/releases/stable/latest/zed-linux-aarch64.tar.gz)
-  ([preview](https://zed.dev/api/releases/preview/latest/zed-linux-aarch64.tar.gz))
+- [zed-linux-x86_64.tar.gz](https://cloud.zed.dev/releases/stable/latest/download?asset=zed&arch=x86_64&os=linux&source=docs)
+  ([preview](https://cloud.zed.dev/releases/preview/latest/download?asset=zed&arch=x86_64&os=linux&source=docs))
+- [zed-linux-aarch64.tar.gz](https://cloud.zed.dev/releases/stable/latest/download?asset=zed&arch=aarch64&os=linux&source=docs)
+  ([preview](https://cloud.zed.dev/releases/preview/latest/download?asset=zed&arch=aarch64&os=linux&source=docs))
 
 Then ensure that the `zed` binary in the tarball is on your path. The easiest way is to unpack the tarball and create a symlink:
 

script/get-released-version

@@ -18,4 +18,4 @@ case $channel in
     ;;
 esac
 
-curl -s "https://zed.dev/api/releases/latest?asset=zed&os=macos&arch=aarch64$query" | jq -r .version
+curl -s "https://cloud.zed.dev/releases/$channel/latest/asset?asset=zed&os=macos&arch=aarch64" | jq -r .version

script/install.sh

@@ -82,7 +82,7 @@ linux() {
         cp "$ZED_BUNDLE_PATH" "$temp/zed-linux-$arch.tar.gz"
     else
         echo "Downloading Zed"
-        curl "https://zed.dev/api/releases/$channel/latest/zed-linux-$arch.tar.gz" > "$temp/zed-linux-$arch.tar.gz"
+        curl "https://cloud.zed.dev/releases/$channel/latest/download?asset=zed&arch=$arch&os=linux&source=install.sh" > "$temp/zed-linux-$arch.tar.gz"
     fi
 
     suffix=""
@@ -135,7 +135,7 @@ linux() {
 
 macos() {
     echo "Downloading Zed"
-    curl "https://zed.dev/api/releases/$channel/latest/Zed-$arch.dmg" > "$temp/Zed-$arch.dmg"
+    curl "https://cloud.zed.dev/releases/$channel/latest/download?asset=zed&os=macos&arch=$arch&source=install.sh" > "$temp/Zed-$arch.dmg"
     hdiutil attach -quiet "$temp/Zed-$arch.dmg" -mountpoint "$temp/mount"
     app="$(cd "$temp/mount/"; echo *.app)"
     echo "Installing $app"