Create a complete web and api server

[malpercio-dev]

In order to lay a framework in which we can continue to build out the atBB AppView, this PR adds a basic HTML page, api route, and health checking.

• axum, built on top of hyper, is used to provide a lightweight web framework
• tera provides a templating engine to render HTML server-side
• tower_http provides middleware for serving static content from a directory
• health to assist in periodic health checking
• htmx is included in the client bundle to provide later interactivity

The basic structure of the repository is now as follows:

-- src
   |-- api               # module for the api
   |   |-- routes        # axum routes
   |   |   |-- healthz   # mounted at /healthz, provides checks for container orchestration
   |   |   |-- v1        # mounted at /v1
   |-- models            # module for shared internal models
   |-- resources         # module for shared resources such as databases, external services
   |-- web               # module for the webapp
   |   |-- pages         # axum routes for server rendering pages, mounted at /
   |   |-- static        # static content, mounted at /static
   |   |-- templates     # tera templates for use in server rendering HMTL