Parser

This is a simple parser that crawls the pages of one site (within the domain) and collects basic SEO/content data.

What it collects:
- `url` of the page
- `title`
- first `h1`
- `meta description`
- number of internal links (`links_count`)
- list of internal links (`links`, only in JSON)

The result is saved in two formats:
- `site_data.json` (full data)
- `site_data.csv` (short table)