use build constraints for embed, clean up makefile

internal-files/external-files and compile-debug are gone, the
environment variables INTERNAL=on/off and DEBUG=on/off replace them.

go.mod

@@ -9,6 +9,7 @@ replace github.com/hrfee/jfa-go/common => ./common
 replace github.com/hrfee/jfa-go/ombi => ./ombi
 
 require (
+	github.com/cpuguy83/go-md2man/v2 v2.0.0 // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/fatih/color v1.10.0
 	github.com/fsnotify/fsnotify v1.4.9
@@ -17,6 +18,7 @@ require (
 	github.com/gin-gonic/gin v1.6.3
 	github.com/go-chi/chi v4.1.2+incompatible // indirect
 	github.com/go-openapi/spec v0.20.3 // indirect
+	github.com/go-openapi/swag v0.19.15 // indirect
 	github.com/go-playground/validator/v10 v10.4.1 // indirect
 	github.com/golang/protobuf v1.4.3 // indirect
 	github.com/gomarkdown/markdown v0.0.0-20210208175418-bda154fe17d8
@@ -31,6 +33,7 @@ require (
 	github.com/mailgun/mailgun-go/v4 v4.3.0
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/smartystreets/goconvey v1.6.4 // indirect
 	github.com/swaggo/files v0.0.0-20190704085106-630677cd5c14
 	github.com/swaggo/gin-swagger v1.3.0
@@ -38,8 +41,8 @@ require (
 	github.com/ugorji/go v1.2.0 // indirect
 	github.com/writeas/go-strip-markdown v2.0.1+incompatible
 	golang.org/x/crypto v0.0.0-20201112155050-0c6587e931a9 // indirect
-	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 // indirect
-	golang.org/x/sys v0.0.0-20210305230114-8fe3ee5dd75b // indirect
+	golang.org/x/net v0.0.0-20210331212208-0fccb6fa2b5c // indirect
+	golang.org/x/sys v0.0.0-20210331175145-43e1dd70ce54 // indirect
 	golang.org/x/tools v0.1.0 // indirect
 	google.golang.org/protobuf v1.25.0 // indirect
 	gopkg.in/ini.v1 v1.62.0