Update configuration and usage of font weights

[victorlin]

These are the weights that have been configured to be available for Lato: 300, 400, 700

These are the weights used in styles: 200, 300, 400, 500

For the weights that are used but not available (200, 500), the browser will use an available weight. What's chosen seems to vary per browser.

For the configured weight that is unused (700), this means unnecessary network requests for unused font files. Each font file is ~15kB and there are two per weight (normal and italic) so this is 30kB of unused font files.

Possible solutions

1. ⛔️ Install weights of 200 and 500.
   • These are not available for Lato.
2. Replace usage of 200 with 300, and 500 with 400.
3. Remove 700 from the list of configured weights.

[jameshadfield]

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