Add a documentation page to GH pages

[doomspork]

We need an area to document not only the API endpoints but instructions for running the Docker container.

• [ ] API POST request (JSON/XML support)
• [ ] Availability/healthcheck endpoint
• [ ] Supported symbologies
  • Formal name — Code 128A (Code Set A)
  • Barcoded value — code128a
  • Example valid data
  • Sample barcode optional
• [ ] Supported image formats
• [ ] Document Docker usage

[jamesbrink]

tisk tisk tisk.. if you're gonna own it then OWN IT. :rofl: @doomspork I can take on some of this while I work on #66 if you like.

[doomspork]

The need for these features hasn't come up and you vanished! Welcome back.