Add configuration files for Renovate Bot and update README.md with project overview and features.

.gitea/workflows/renovate.yml

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+name: renovate
+on:
+  schedule:
+    - cron: "@daily"
+  push:
+    branches:
+      - master
+jobs:
+  renovate:
+    runs-on: linux_amd64
+    container: ghcr.io/renovatebot/renovate:latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: renovate
+        env:
+          RENOVATE_PLATFORM: "gitea"
+          RENOVATE_ENDPOINT: "https://dev.unebaguette.fr/api/v1"
+          RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}
+          RENOVATE_GIT_AUTHOR: "Renovate Bot <[email protected]>"
+          RENOVATE_AUTODISCOVER: true
+          RENOVATE_OPTIMIZE_FOR_DISABLED: true
+          RENOVATE_GITHUB_COM_TOKEN: ${{ secrets.GIT_PAT_TOKEN_HUB  }}
+          LOG_LEVEL: "info"

README.md

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+# Renovate Bot
+
+## Overview
+
+Renovate Bot is an automated dependency management tool that keeps your project dependencies up to date.
+
+## Features
+
+- Automated dependency updates
+- Customizable update schedules
+- Pull request automation
+- Multi-platform support
+
+## Configuration
+
+See the configuration files in this repository for setup instructions.
+
+## Documentation
+
+For more information, visit the [Renovate documentation](https://docs.renovatebot.com/).