Release materials for 0.2.0

[bmicklea]

Set of materials for the 0.2.0 release:

• [x] Release blog explaining model parts and Dev mode [Gorkem]
• [ ] #308
• [x] #169 -- updated for model parts [Rajat]
• [x] #307
• [x] Update readme with dev mode and fine-tuning / RAG capabilities [Brad]
• [x] Add a comment on this post to redirect to the new blog