text: Title: Make outputs and index names for Custom Indexes feature look nicer (add embeds)
  Body: Use discord embeds to make the outputs returned by the /index commands look nicer and look more cohesive with the theme of our bot. 
  
  Also index names that show up in /index compose and /index load and etc can be made to look nicer, maybe there's an easier way for a user to name the index as they make it so we don't have to default to the name of the file + the time? Not sure though, looking for insights on this. 