style(extension): tweak welcome page text opacity and remove redundant copy

extension/src/welcome.html

@@ -74,6 +74,7 @@
 
       p {
         margin-bottom: 1rem;
+        opacity: 0.8;
       }
 
       a {
@@ -116,6 +117,7 @@
 
       li {
         margin-bottom: 0.5rem;
+        opacity: 0.8;
       }
 
       strong {
@@ -225,9 +227,6 @@
           <span class="step-number">3</span>
           <div class="step-content">
             <strong>Install the CLI and run a command</strong>
-            <p>
-              Install the CLI and start automating the browser:
-            </p>
             <pre><code class="language-bash"># install the CLI globally
 npm i -g playwriter
 # navigate to a URL in the active tab