Add SEO-optimized Twitter meta titles for installation pages

- Add Twitter meta tags to Windows, Linux, and Mac installation pages
- Optimize meta titles: 'Jan on [Platform]' for better SEO
- Maintain consistent meta descriptions across all platforms
- Keep original page titles unchanged for user experience

docs/src/pages/docs/desktop/install/linux.mdx

@@ -1,11 +1,12 @@
 ---
 title: Linux
-description: Install Jan to run AI models locally on Linux. Works offline with GPU acceleration on Ubuntu, Debian, and other distributions.
+description: Download Jan on Linux to run AI models locally. Jan is a free, open-source ChatGPT alternative to run offline.
 keywords:
   [
     Jan,
     Customizable Intelligence, LLM,
     local AI,
+    Jan on Linux,
     privacy focus,
     free and open source,
     private and offline,
@@ -18,15 +19,17 @@ keywords:
     installation,
     "desktop"
   ]
+twitter:
+  card: summary_large_image
+  site: "@jandotai"
+  title: "Jan on Linux"
+  description: "Download Jan on Linux to run AI models locally. Jan is a free, open-source ChatGPT alternative to run offline."
 ---
 
-
 import FAQBox from '@/components/FaqBox'
 import { Tabs, Callout, Steps } from 'nextra/components'
 import { Settings } from 'lucide-react'
 
-
-
 # Linux Installation
 Instructions for installing Jan on Linux.
 

docs/src/pages/docs/desktop/install/mac.mdx

@@ -1,11 +1,11 @@
 ---
 title: Mac
-description: Get started quickly with Jan - a local AI that runs on your computer. Install Jan and pick your model to start chatting.
+description: Download Jan on Mac to run AI models locally. Jan is a free, open-source ChatGPT alternative to run offline.
-keywords:
   [
     Jan,
     Customizable Intelligence, LLM,
     local AI,
+    Jan on Mac,
     privacy focus,
     free and open source,
     private and offline,
@@ -18,6 +18,11 @@ keywords:
     installation,
     "desktop"
   ]
+twitter:
+  card: summary_large_image
+  site: "@jandotai"
+  title: "Jan on Mac"
+  description: "Download Jan on Mac to run AI models locally. Jan is a free, open-source ChatGPT alternative to run offline."
 ---
 
 import { Tabs } from 'nextra/components'

docs/src/pages/docs/desktop/install/windows.mdx

@@ -1,10 +1,11 @@
 ---
 title: Windows
-description: Install Jan to run AI models locally on Windows. Works offline with GPU acceleration on Windows 10 and 11.
+description: Download Jan on Windows to run AI models locally. Jan is a free, open-source ChatGPT alternative to run offline.
 keywords:
   [
     Jan,
     Customizable Intelligence, LLM,
+    Jan on Windows,
     local AI,
     privacy focus,
     free and open source,
@@ -18,6 +19,11 @@ keywords:
     installation,
     "desktop"
   ]
+twitter:
+  card: summary_large_image
+  site: "@jandotai"
+  title: "Jan on Windows"
+  description: "Download Jan on Windows to run AI models locally. Jan is a free, open-source ChatGPT alternative to run offline."
 ---
 
 import { Tabs, Callout, Steps } from 'nextra/components'