feat(mainmatter): replace 'simplabs' with 'Mainmatter'

[oscard0m]

Fixes #373

TODO

• update Twitter URL

[oscard0m]

I've reproduced the round logo with CSS. Should we have it available as SVG/PNG in our Mainmatter logo folder?

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[marcoow]

@oscard0m the round symbol is in Google Drive already

[oscard0m]

@oscard0m the round symbol is in Google Drive already

Can you link it @marcoow? I don't find it.

[marcoow]

https://drive.google.com/drive/folders/1ozJ0VDxt1NcQM-OoqL753kyZkqzNJYhP?usp=sharing

[oscard0m]

https://drive.google.com/drive/folders/1ozJ0VDxt1NcQM-OoqL753kyZkqzNJYhP?usp=sharing

I don't see the round versions. Maybe they are not shared with my Google user? This is what I see for the white symbol:

[inesoaresilva]

https://drive.google.com/drive/folders/1ozJ0VDxt1NcQM-OoqL753kyZkqzNJYhP?usp=sharing

I don't see the round versions. Maybe they are not shared with my Google user? This is what I see for the white symbol:

I also didn't find it

I'm approving, the changes look good to me