Add a /when-to-use page

[simonw]

Similar in spirit to https://www.sqlite.org/whentouse.html - people always appreciate it when there is host documentation describing when a tool is and is not appropriate.

Follows:

• 109

[simonw]

Some loose ideas:

Appropriate:

• You have data you wish to publish that's up to 2GB in size (this should work just fine)
• You have up to 10GB of data and you're willing to put work into picking good indexes and being thoughtful about your query patterns
• You data changes infrequently, and you can afford to re-deploy on changes (though Datasette can handle constant updates with a bit of extra work)

Inappropriate:

• Over 1GB of constantly growing log data - look into Splunk or Elasticsearch or tools like that instead
• Data where you need to support many concurrent writers
• Data that's mostly big binary images and videos and suchlike - though you could host those files in something like S3 and have metadata about them (and URLs to the files) in Datasette

Really need to put quite a bit more thought into this - the above is just some quick initial notes.