Add docs for An stephensi (As1)

[tristanpwdennis]

• Add as1.ipynb
• Add api.md
• Add cloud.ipynb
• Add download.ipynb
• Update toc
• Update landing page
• Update API calls in notebooks
• Update download guide with ENA accessions and uptodate site filters

[tristanpwdennis]

No ENA accessions as discussed. Think this is ready for a review.

[tristanpwdennis]

Added ToU