feat: replace Monaco by Ace

- Remove the Monaco Editor because it was to heavy and hard to integrate
- Use Ace instead
- Use the lowercase identifier for languages (ex: "Text" -> "text")
- Select automatically the default language in the drop down to create a note
  (like the expiration)
- Add `ace_directory` to serve assets from a local folder instead of a CDN
- "hcl" syntax highlighting has been removed
- "go" syntax highlighting has been renamed to "golang"

Signed-off-by: Julien Riou <julien@riou.xyz>

src/server/handlers_web.go

@@ -21,11 +21,13 @@ type PageData struct {
 	Version                string
 	Expirations            []int
 	Expiration             int
+	Language               string
 	Languages              []string
 	Err                    error
 	URL                    string
 	Note                   *Note
 	EnableUploadFileButton bool
+	AceDirectory           string
 	BootstrapDirectory     string
 }