feat(i18n): add initial Russian localization for documentation and site config

- Added full Russian translations for all main documentation sections () into .
- Sections translated include: key features, installation, getting started, all core concepts, advanced features, API reference, FAQ, links, additional modules, contributing, and license.
- Updated  to ensure language switching is available and Russian locale is active.
- Each Russian file preserves the structure and formatting of the original Markdown, with machine-aided draft translation for immediate use.
- Lays the groundwork for UI language switching (en/ru) and enables further manual translation refinement and review.

website/docusaurus.config.ts

@@ -112,16 +112,8 @@ const config: Config = {
           title: 'Community',
           items: [
             {
-              label: 'Stack Overflow',
-              href: 'https://stackoverflow.com/questions/tagged/docusaurus',
-            },
-            {
-              label: 'Discord',
-              href: 'https://discordapp.com/invite/docusaurus',
-            },
-            {
-              label: 'X',
-              href: 'https://x.com/docusaurus',
+              label: 'Telegram',
+              href: 'https://t.me/+22IVT0vqXBg1NDdi',
             },
           ],
         },