Use go:embed for static assets (#77)

.github/workflows/lint.yaml

Dockerfile

Makefile

httpbin/assets/assets.go

httpbin/handlers.go

httpbin/httpbin.go

httpbin/static/forms-post.html

httpbin/static/image.jpeg

httpbin/static/image.png

httpbin/static/image.svg

httpbin/static/image.webp

httpbin/static/index.html

httpbin/static/moby.html

httpbin/static/sample.json

httpbin/static/sample.xml

httpbin/static/utf8.html

httpbin/static_assets.go

httpbin/static_assets_test.go