use npm install as primary setup method in docs and readme

Author: wassertim

README.md

@@ -17,12 +17,20 @@ This project is open source under the MIT license. You're welcome to fork it, ad
 
 ## Setup
 
+```bash
+npm install -g abacus-cli
+```
+
+Chromium is downloaded automatically on install for browser automation.
+
+### From source
+
 ```bash
 git clone https://github.com/wassertim/abacus-cli.git
 cd abacus-cli
 npm install
 npm run build
-npm link          # makes `abacus` available globally
+npm link
 ```
 
 ### Configuration

site/src/pages/de/getting-started.astro

@@ -24,12 +24,9 @@ const t = getTranslations(locale);
 
   <h2 id="installation">{t.gettingStarted.installation}</h2>
   <CodeBlock title="Terminal">
-    <pre><code>git clone https://github.com/wassertim/abacus-cli.git
-cd abacus-cli
-npm install
-npm run build
-npm link          # macht `abacus` global verfügbar</code></pre>
+    <pre><code>npm install -g abacus-cli</code></pre>
   </CodeBlock>
+  <p>Chromium wird bei der Installation automatisch heruntergeladen.</p>
 
   <h2 id="configuration">{t.gettingStarted.configuration}</h2>
   <p>Setzen Sie die URL Ihrer Abacus-Instanz als Umgebungsvariable:</p>

site/src/pages/en/getting-started.astro

@@ -24,12 +24,9 @@ const t = getTranslations(locale);
 
   <h2 id="installation">{t.gettingStarted.installation}</h2>
   <CodeBlock title="Terminal">
-    <pre><code>git clone https://github.com/wassertim/abacus-cli.git
-cd abacus-cli
-npm install
-npm run build
-npm link          # makes `abacus` available globally</code></pre>
+    <pre><code>npm install -g abacus-cli</code></pre>
   </CodeBlock>
+  <p>Chromium is downloaded automatically on install for browser automation.</p>
 
   <h2 id="configuration">{t.gettingStarted.configuration}</h2>
   <p>Set your Abacus instance URL via environment variable:</p>