Add notice atop md->gmi translated pages

src/gmi/tpl.go

@@ -203,6 +203,10 @@ func (a *api) tplHandler() (gemini.Handler, error) {
 			path := filepath.Join("posts", id) + ".gmi"
 			return blogURL(a.params.PublicURL, path, true)
 		},
+		"PostHTTPURL": func(id string) string {
+			path := filepath.Join("posts", id)
+			return preprocessFuncs.BlogHTTPURL(path)
+		},
 	})
 
 	err := fs.WalkDir(tplFS, "tpl", func(path string, d fs.DirEntry, err error) error {

src/gmi/tpl/posts/post.gmi

@@ -1,5 +1,13 @@
 {{ $post := .GetPostByID (.GetQueryValue "id" "") -}}
 
+{{ if eq $post.Format "md" -}}
+This post has been translated from it's original markdown format, if it seems
+busted it might appear better over HTTP:
+
+=> {{ PostHTTPURL $post.ID }}
+
+{{ end -}}
+
 # {{ $post.Title }}
 
 {{ if ne $post.Description "" -}}