jamesog
Migrate static assets to embed.FS
HTML templates and static files were embedded in the binary using go-bindata.
As of Go 1.16, the new embed package can perform the same thing natively without needing extra tooling.
Everything which referenced a static asset now does so using an embed.FS. This allowed simplifying quite a bit of the code handling that as it's now much more straightforward to handle thanks to the FS interface. The html/template package can parse embed.FS and net/http can serve it straight as a FileServer.
The minimum Go version required now is 1.16, reflected in go.mod.
The Makefile is now no longer really needed, but the sample-data target is useful, so it's been left in place along with a target for building the binary, but the README now says to use go build instead of make.
Vendored dependencies are updated along with this.
