Fix Linux install commands

The Linux install commands relied on grepping for
`browser_download_url` in the latest release JSON. Unfortunately there
are more than one occurrence of that string, and it produces an
incorrect download URL.

Modify the Linux install commands to instead grep for the latest
version, and then explicitly generate the download URL based on that.

Signed-off-by: Andrew Seigner <[email protected]>

Author: siggy

docs/partials/replicated-cli/_install-linux.mdx

@@ -1,10 +1,11 @@
 Run the following command:
 
     ```shell
-    curl -Ls $(curl -s https://api.github.com/repos/replicatedhq/replicated/releases/latest \
-      | grep "browser_download_url.*linux_amd64.tar.gz" \
-      | cut -d : -f 2,3 \
-      | tr -d \") -o replicated.tar.gz
+    version=$(curl -s https://api.github.com/repos/replicatedhq/replicated/releases/latest \
+      | grep -m1 -Po '"tag_name":\s*"v\K[^"]+')
+    curl -Ls \
+      "https://github.com/replicatedhq/replicated/releases/download/v${version}/replicated_${version}_linux_amd64.tar.gz" \
+      -o replicated.tar.gz
     tar xf replicated.tar.gz replicated && rm replicated.tar.gz
     mv replicated /usr/local/bin/replicated
-    ```
+    ```