docs(readme): update README for clarity and consistency

- Translated sections from German to English for better accessibility.
- Enhanced the structure by clearly defining the workspace relationship and local development instructions.
- Improved descriptions for Docker setup and deployment processes to ensure users understand the requirements and context.
- Updated links and formatting for consistency throughout the document.

This commit aims to improve the overall clarity and usability of the README documentation.

sidebars.js

@@ -181,19 +181,6 @@ const sidebars = {
         },
       ],
     },
-    {
-      type: 'category',
-      label: 'Legacy',
-      link: {type: 'doc', id: 'legacy/index'},
-      items: [
-        'legacy/index',
-        'topics/wiki-import/overview',
-        {
-          type: 'autogenerated',
-          dirName: 'legacy/wiki-import',
-        },
-      ],
-    },
     'SPONSORS',
   ],
 };