Revert "Add MIME type to video <source> tag (#1992)"
Revert "Add MIME type to video <source> tag (#1992)"

This reverts commit e60fd824008be1c210908b25c945c54767ecd3ea.

getgrav/grav,Vivalldi/grav,tomzx/blog.tomrochette.com,stell/grav,tomzx/blog.tomrochette.com,notklaatu/grav,tomzx/blog.tomrochette.com,Vivalldi/grav,notklaatu/grav,getgrav/grav,tomzx/blog.tomrochette.com