fix(docs): автоматически закрепляет index.md первым в сайдбаре

Добавлен Node-скрипт, который инжектит sidebar_position: 0
в front matter docs/index.md перед сборкой Docusaurus.

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

docusaurus/README.md

@@ -23,19 +23,3 @@ yarn build
 ```
 
 This command generates static content into the `build` directory and can be served using any static contents hosting service.
-
-## Deployment
-
-Using SSH:
-
-```bash
-USE_SSH=true yarn deploy
-```
-
-Not using SSH:
-
-```bash
-GIT_USER=<Your GitHub username> yarn deploy
-```
-
-If you are using GitHub pages for hosting, this command is a convenient way to build the website and push to the `gh-pages` branch.