docs: update docusaurus configuration and documentation structure

- Revised the tagline in `docusaurus.config.js` for improved clarity on the documentation's focus.
- Removed German localization support from the configuration to streamline the user experience.
- Updated navigation items in the sidebar to better reflect the current structure, emphasizing player and developer resources.
- Enhanced the README and various documentation files to clarify the repository layout and improve accessibility for users.
- Adjusted links and descriptions throughout the documentation to ensure consistency and accuracy.

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

src/i18n/homepage/index.ts

@@ -1,25 +1,8 @@
-import { de } from './de';
-import { en } from './en';
-import type { HomepageContent, LocaleKey } from './types';
+import {en} from './en';
+import type {HomepageContent} from './types';
 
-const homepageByLocale: Record<LocaleKey, HomepageContent> = {
-  en,
-  de,
-};
+export type {HomepageContent, LocaleKey} from './types';
 
-export type { HomepageContent, LocaleKey } from './types';
-
-export function getHomepageContent(locale: string): HomepageContent {
-  const normalizedLocale = (locale || 'en').toLowerCase();
-  const languageOnly = normalizedLocale.split('-')[0] as LocaleKey;
-
-  if (normalizedLocale in homepageByLocale) {
-    return homepageByLocale[normalizedLocale as LocaleKey];
-  }
-
-  if (languageOnly in homepageByLocale) {
-    return homepageByLocale[languageOnly];
-  }
-
-  return homepageByLocale.en;
+export function getHomepageContent(_locale: string): HomepageContent {
+  return en;
 }