Fetch `photos/index.json` "locally"

[iwittkau]

To reduce load times, a XHR can load the photo feed directly from within the page instead of calling back to https://microgram.cleverdevil.io/.

xhr.open('GET', "/photos/index.json", true);

instead of

xhr.open('GET', "https://microgram.cleverdevil.io/", true);