Introduce all releases announcements on the website (#277)
- Introduce newly created v0.2.0.md which was an important step into Silkaj history
- Add v0.3 and v0.4 introductory summaries
- Proofread
- Rename v0.8.md file to v0.8.0.md
- Introduce 'minor' category
- Remove '@' in front of names
- Remove Diaspora* broken links
Close #277 (closed)