title: leaflet load markers and pop ups from external file
body: <p>I am currently building a leaflet map where I will implement a bunch of markers with popups.
  I want all of my markers and popups stored in an external file to keep the code as clean as possible. My question is, how can I achieve this? Do I create a geojson file with the markers and popups and if so, how do I load such a geojson into my html file if I want the geojson file to be stored locally (avoiding CORS policy error) ? What other options do I have?
  Thanks for the help in advance!</p>