Investigate why fill="none" is removed in generate-icons script

[taysea]

Currently, instances of fill="none" are getting removed by the generate-icons script.

Ideally, we should be able to edit the .svg files as source of truth and let generate-icons convert these into react components. Right now, we have to edit the .js files and not run generate-icons otherwise fill="none" will get removed: #317

Some potential avenues to explore are the plugins related to svgo (I tried with little success):

• https://github.com/svg/svgo/blob/main/plugins/removeAttrs.js
• https://github.com/svg/svgo/blob/main/plugins/removeUselessStrokeAndFill.js
• Remove fill and stroke unless "none" svg/svgo#440
• other aspects of generate-icons.js

Related to #298 #263 #310