Use HTTPS url for cloning

Author: jbrooksuk

v3.x/installation.mdx

@@ -24,7 +24,7 @@ If you are looking to migrate from Cachet v2.x, please refer to the [migration g
     <Step title="Step 1">
         Clone the Cachet repository:
         ```bash
-        git clone -b 3.x git@github.com:cachethq/cachet.git
+        git clone -b 3.x https://github.com/cachethq/cachet.git
         cd cachet
         ```
     </Step>
@@ -90,4 +90,4 @@ If you are looking to migrate from Cachet v2.x, please refer to the [migration g
         * * * * * php /path/to/cachet/artisan schedule:run >> /dev/null 2>&1
         ```
     </Step>
-</Steps>
+</Steps>