fix: update Materia branding

[davlgd]

I've updated texts, let me know if you need/want me to change more references to Materia KV

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[florian-sanders-cc]

The commit message is missing the scope (cc-addon-credentials), it's optional but it's a bit better for the changelog so I will amend the commit and force push

[florian-sanders-cc]

My bad I reviewed only the commit and forgot to check the preview: we can also update the story title from 👍 Data loaded (materia db kv) to 👍 Data loaded (materia kv). I'll force push again :innocent:

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