Update Azure deployment example

[gassc]

What I am changing

I've updated the Azure deployment documentation and sample to reflect changes to the titiler codebase (#537), fixes to upstream dependencies (starlette), and updates to the Azure Python function wrapper package.

How I did it

The updates to the Azure sample match the main sample application. The others were made through trial and error.

How you can test it

No tests for these examples, run as-is.

Related Issues

• changes to the sample required by changes made here: simplification of titiler.application code (remove custom) #537
• re-enabling of middleware based on this issue being resolved: Starlette app hangs on Azure Functions when middleware based on BaseHTTPMiddleware is used encode/starlette#1320

[vincentsarago]

thanks @gassc, as I have no way to test this I will have to trust you 🙏 😄

[gassc]

@vincentsarago fair enough! I can offer that the previous code example didn't work just based on the way the package structure was refactored in #537.

That said...after getting it running locally, getting it working on Azure has been a whole other challenge, due to an error with DEFAULT_TEMPLATES in src/titiler/core/titiler/core/factory.py. I'll investigate that further and log a separate issue (and pull request if I can figure it out).