Below:

* Removed the  build step installing 'tree' as it's preinstalled in ubuntu-latest of GitHub Actions
* Fixed: Use Classless version of PicoCSS in index.html

Author: SanmayJoshi

.github/workflows/go.yml

@@ -53,8 +53,9 @@ jobs:
         echo "Ready to deploy!"
     - name: Output the files structure into a JSON file
       run: |
-        sudo apt update
-        sudo apt install -y tree
+        # GitHub Actions' ubuntu-latest comes preinstalled with tree. So no need to install tree.
+        #sudo apt update
+        #sudo apt install -y tree
         tree -J public > ./public/files.json
         echo "JSON Manifest generated with the directory structure!"
     - name: Make web pages available

dist/pages/index.html

@@ -4,7 +4,7 @@
   <meta charset="UTF-8">
   <title>Artifact Explorer</title>
   <!-- PicoCSS via CDN -->
-  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@picocss/pico@latest/css/pico.min.css">
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@picocss/pico@latest/css/pico.classless.min.css">
   <style>
     .file-list {
       list-style: none;