docs: remove unmaintained or low-quality entries across multiple categories

Removed entries that no longer meet quality or maintenance standards:
- NLP: langid.py (unmaintained)
- Web Scraping: requests-html, toapi (unmaintained)
- Search: elasticsearch-dsl-py (redundant alongside elasticsearch-py)
- DevOps: python-lambda, delegator.py (unmaintained)
- HTML/XML: untangle (unmaintained)

Co-Authored-By: Claude <[email protected]>