More How-Tos on various topics

[wolfgangwalther]

We have tons of questions on "how to do X" - and many ideas, too. The old postgrest-docs repo still has the following issues open:

Auth-related:

• Note how to protect JWT secret at rest in the db postgrest-docs#28
• How-to for using JWT in cookies postgrest-docs#208
• Tutorial for login with jwt/sessions  postgrest-docs#240
• Example code to show how to install pgjwt extension in docker. postgrest-docs#309
• Add topic or how-to for session based authentication postgrest-docs#323
• Add sign up example to the auth page postgrest-docs#435

Dealing with files / mimetypes:

• Provide an nginx snippet for getting csv from the url postgrest-docs#157
• Clarify Providing images for <img> how-to postgrest-docs#327
• Add how-to upload images/files (bytea) postgrest-docs#540
• Docs for geojson postgrest-docs#552
• Add messagepack return type postgrest-docs#696

All other How-Tos:

• Demonstrate API versioning with schemas postgrest-docs#69
• How to hook on operations aka Where goes business logic? postgrest-docs#71
• how-to for filtering by embedded resource count postgrest-docs#211
• Automatic reload of schema cache on cache miss - add event trigger to tutorials postgrest-docs#513
• Feature request: Allow for header arguments to be passed in query too postgrest-docs#565
• pinpoint faulty row in bulk insert postgrest-docs#608
• Ordering by random postgrest-docs#671