replace <pre> with <code> because rendering issues

src/pages/installation.astro

···
         <li>Medium terminal knowledge</li>
     </ul>
     <h2>Installing dependecies + running the app</h2>
-    Run <pre>npm i</pre> if you are on Node.js or <pre>bun i</pre> if you are on
+    Run <code>npm i</code> if you are on Node.js or <code>bun i</code> if you are on
     Bun.
     <br />
-    After that, run <pre>npm start</pre> (or <pre>bun start</pre>) and you
+    After that, run <code>npm start</code> (or <code>bun start</code>) and you
     should be able to access Skittr on port 3000!
     <h2>Environment variables</h2>
     <ul>
         <li>
-            <pre>PORT</pre> - the port that Skittr will be listening on other than
+            <code>PORT</code> - the port that Skittr will be listening on other than
             3000 (which is used by default)
         </li>
         <li>
-            <pre>PUBLIC_URL</pre> - the public URL of your Skittr instance, it's
+            <code>PUBLIC_URL</code> - the public URL of your Skittr instance, it's
             recommended to set it up if you plan on hosting it on the public network
         </li>
         <li>
-            <pre>SESSION_SECRET</pre> - the session secret used for cookies, it's
+            <code>SESSION_SECRET</code> - the session secret used for cookies, it's
             a randomized string so feel free to type any string value to it. You
             can even use a keyboard smash!
             <br />