Refactor documentation structure and dependencies for migration to Fumadocs

- Updated `.gitignore` to include new build and generated content directories.
- Removed outdated Mintlify configuration files and documentation.
- Introduced new `MIGRATION.md` to outline the transition from Mintlify to Fumadocs.
- Added `mdx-components.tsx` for MDX component configuration and compatibility.
- Updated `package.json` and `next.config.mjs` for new dependencies and Next.js configuration.
- Created `source.config.ts` for content source configuration.
- Added OpenAPI specification in `openapi.json` for API documentation.
- Removed legacy files and adjusted project structure to align with Fumadocs conventions.

docs/content/docs/overview/generation-history.mdx

@@ -0,0 +1,88 @@
+---
+title: "Generation History"
+description: "Track and manage all your generated audio"
+---
+
+## Overview
+
+Voicebox keeps a complete history of all generated audio, making it easy to find, reuse, and manage your creations.
+
+## Features
+
+<CardGroup cols={2}>
+  <Card title="Full History" icon="clock">
+    Every generation is automatically saved
+  </Card>
+  <Card title="Search & Filter" icon="search">
+    Find by text, voice, or date
+  </Card>
+  <Card title="Re-generate" icon="rotate">
+    Regenerate any past generation with one click
+  </Card>
+  <Card title="Export" icon="download">
+    Download individual or batch exports
+  </Card>
+</CardGroup>
+
+## Viewing History
+
+Navigate to the **History** tab to see all your generations.
+
+Each entry shows:
+- Generated text
+- Voice profile used
+- Timestamp
+- Audio duration
+- Language
+
+## Actions
+
+### Play
+Click any generation to play it immediately.
+
+### Re-generate
+Regenerate with the same settings or modify the text/voice.
+
+### Download
+Export as WAV, MP3, or M4A.
+
+### Delete
+Remove unwanted generations to free up space.
+
+### Add to Story
+Drag generations to the Stories Editor timeline.
+
+## Search & Filter
+
+<Tabs>
+  <Tab title="By Text">
+    Search for specific text content
+    ```
+    "Hello world"
+    ```
+  </Tab>
+  <Tab title="By Voice">
+    Filter by voice profile
+    ```
+    Select from dropdown
+    ```
+  </Tab>
+  <Tab title="By Date">
+    Filter by date range
+    ```
+    Last 7 days, Last 30 days, Custom range
+    ```
+  </Tab>
+</Tabs>
+
+## Storage
+
+History is stored locally:
+
+- **macOS**: `~/Library/Application Support/com.voicebox.app/data/`
+- **Windows**: `%APPDATA%/com.voicebox.app/data/`
+- **Linux**: `~/.config/com.voicebox.app/data/`
+
+<Warning>
+  Deleting the data directory will remove all history. Export important files first.
+</Warning>