feat: Add text editor

Use Monaco Editor to create notes. Support syntax highlighting. Store the
language with the note in the database to later support syntax highlighting in
a note web view.

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

src/server/note.go

@@ -18,6 +18,7 @@ type Note struct {
 	Encrypted       bool      `json:"encrypted"`
 	ExpiresAt       time.Time `json:"expires_at" gorm:"index"`
 	DeleteAfterRead bool      `json:"delete_after_read"`
+	Language        string    `json:"language"`
 }
 
 // Generate ID and compress content before saving to the database