Decouple languages from skills

Both retain the same yaml structure but are not tightly coupled anymore
(like volunteering before).

content.yml

@@ -388,15 +388,56 @@ volunteering:
         en: IT and event management services
 
 skills:
-  - de: Digitales Toolset
-    en: Digital toolset
-    content:
+  - name:
+      de: Autorensoftware
+      en: Authoring software
+    items:
+      - de: LaTeX
+        en: LaTeX
+      - de: Typst
+        en: Typst
+      - de: Quarto
+        en: Quarto
+      - de: Pandoc
+        en: Pandoc
+  - name:
+      de: Datenmanagement
+      en: Data engineering
+    items:
+      - de: SQL
+        en: SQL
+      - de: Web-Scraping & Crawling
+        en: Web-scraping & crawling
+  - name:
+      de: Datenanalyse
+      en: Data analysis
+    items:
+      - de: Python Pandas & Polars
+        en: Python Pandas & Polars
+      - de: Seaborn
+        en: Seaborn
+  - name:
+      de: Programmieren
+      en: Programming
+    items:
+      - de: Python
+        en: Python
+      - de: Go
+        en: Go
+      - de: Bash
+        en: Bash
+      - de: Lua
+        en: Lua
   - name:
       de: Versionskontrollsoftware
       en: Version control software
     items:
       - de: Git
-            en: git
+        en: Git
+      - de: Jujutsu
+        en: Jujutsu
+      - de: Fossil
+        en: Fossil
   - name:
       de: Office-Suite
       en: Office suite
@@ -407,16 +448,6 @@ skills:
         en: Word
       - de: Access
         en: Access
-      - name:
-          de: Autorensoftware
-          en: Authoring software
-        items:
-          - de: LaTeX
-            en: LaTeX
-          - de: Pandoc
-            en: pandoc
-          - de: Quarto
-            en: quarto
   - name:
       de: Web Content Management
       en: Web content management
@@ -435,22 +466,6 @@ skills:
         en: CSS
       - de: JavaScript
         en: JavaScript
-      - name:
-          de: Datenanalyse
-          en: Data Analysis
-        items:
-          - de: Python Pandas
-            en: Python pandas
-          - de: Plotly
-            en: Plotly
-      - name:
-          de: Datenmanagement
-          en: Data engineering
-        items:
-          - de: Web-Scraping/-Crawling
-            en: Web-scraping/-crawling
-          - de: SQL
-            en: SQL
   - name:
       de: Design Software
       en: Design software
@@ -459,9 +474,8 @@ skills:
         en: GIMP
       - de: Adobe Suite
         en: Adobe suite
-  - de: Sprachen
-    en: Languages
-    content:
+
+languages:
   - name:
       de: Deutsch
       en: German