Embedding only needed weights for Open Sans and Scope One

Problem/Motivation

This issue is a follow-up from Github.

Now, the Umami theme is embedding h fonts Scope One and Open Sans.

'https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700,700i|Scope+One'

But only the needed weights should be used for each one:

• Scope One has only one weight, so changing wrong 700 weights to 400.
• Open Sans has several weights and we're loading all the font. Only the needed weights should be used: 400 and 700.

Proposed resolution

Load only the needed weights for each font.