Investigate font-weight discrepancy (and fix if needed)

[angela-tran]

This can be changed in future PR's b/c it's not a big deal - but I'm not sure if this is actually rendering font-weight 600 (Semi Bold) font: I typed in CAREERS here at weight 600, size 12px here (https://fonts.google.com/specimen/Source+Code+Pro?preview.text=CAREERS&preview.text_type=custom) and compared it with the Netlify. I think we need to add the SemiBold font file in this directory https://github.com/compilerla/compiler.la/tree/main/fonts and make sure the SemiBold file is getting rendered.

Originally posted by @machikoyasuda in #87 (comment)