0.4.0 release

[uogbuji]

Planning ticket for the next major release.

• [ ] Local model loading
• [ ] Model introspection (add to a demo?) - #10
• [x] embedding_helper.py fixes
• [x] Test suite expansion (#30)
• [x] Word loom: #28
• [x] more complete Qdrant implementation (removing entries, etc)

Target date: 22 August 2023

[uogbuji]

Let's just save the first 2 items for another release. Bumping the version number, and we're good to wrap this up.

[uogbuji]

All done!