Remove online google fonts to speed up tests

__tests__/integration/mirador/auth.html

__tests__/integration/mirador/blank.html

__tests__/integration/mirador/collections.html

__tests__/integration/mirador/contentsearch.html

__tests__/integration/mirador/embedding.html

__tests__/integration/mirador/index.html

__tests__/integration/mirador/layers.html

__tests__/integration/mirador/level0.html

__tests__/integration/mirador/minimalist.html

__tests__/integration/mirador/rtl.html

__tests__/integration/mirador/svg_annos.html

__tests__/integration/mirador/toc.html

__tests__/integration/mirador/v3.html

__tests__/integration/mirador/video.html