[WIP] Update docker landing page to proper dashboard

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Running docker give HeadlessX landing page on port 3000</issue_title>
<issue_description>Hi, why when we self host and run docker at port 3000 we get basicaly HeadlessX landing page? This is the first time is see such design. It would be better to have there something like Swagger or proper dashboard, not landing page of project. </issue_description>

Comments on the Issue (you are @copilot in this section)

@saifyxpro Thanks for your interest in HeadlessX! You're absolutely right – the current landing page is temporary while we're building out the full v2.0 platform. Right now we support core server APIs like /api/html and /api/content, but we're actively working on a modern React dashboard built with Next.js App Router where you'll be able to do everything directly through the UI without touching code. We're also planning to create an MCP integration and tons of other interesting features to make web scraping accessible and powerful. The goal is to provide something significantly better than existing solutions like Browserless, but fully open-source with advanced anti-detection and automation features. Your feedback is really helpful in prioritizing what matters most, and we'll have the dashboard and proper frontend experience ready very soon!

Fixes #8

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