feat: rename SharedInbox to sharedinbox.de in UI and website (#108)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

website/content/posts/welcome.md

@@ -1,7 +1,7 @@
 ---
-title: 'Welcome to SharedInbox'
+title: 'Welcome to sharedinbox.de'
 date: 2026-05-12T08:00:00Z
 draft: false
 ---
 
-Welcome to the official website of SharedInbox!
+Welcome to the official website of sharedinbox.de!

website/content/privacy.md

@@ -12,10 +12,10 @@ Thomas Güttler Email: info@thomas-guettler.de
 
 ## 2. Overview
 
-SharedInbox is an email client for desktop and mobile. This policy explains what data we process and
+sharedinbox.de is an email client for desktop and mobile. This policy explains what data we process and
 how.
 
-## 3. The SharedInbox Mail App
+## 3. The sharedinbox.de Mail App
 
 ### What data the app processes
 
@@ -30,7 +30,7 @@ The app processes the following data **exclusively on your device**:
 ### Network connections
 
 The app connects only to the email servers you configure (IMAP/SMTP). It does not connect to any
-SharedInbox servers, analytics services, or third-party tracking services.
+sharedinbox.de servers, analytics services, or third-party tracking services.
 
 ### No telemetry
 

website/hugo.toml

@@ -1,16 +1,16 @@
 baseURL = 'https://sharedinbox.de/'
 languageCode = 'en-us'
-title = 'SharedInbox'
+title = 'sharedinbox.de'
 theme = 'PaperMod'
 
 [params]
     env = 'production'
-    title = 'SharedInbox'
+    title = 'sharedinbox.de'
     description = 'IMAP/SMTP Email Client'
-    author = 'SharedInbox Team'
+    author = 'sharedinbox.de Team'
 
     [params.homeInfoParams]
-        Title = "SharedInbox"
+        Title = "sharedinbox.de"
         Content = "The modern IMAP/SMTP email client for your desktop and mobile."
 
     [[params.socialIcons]]