feat(100): remove mailchimp in favor of emailoctupus form

[TheJoin95]

Description

Closes #100

Changes

• [ ] Bugfix
• [] Feature
• [ ] Code style update
• [x] Refactor
• [ ] Build-related changes
• [ ] Other, please describe:

Does this PR introduce a breaking change? (check one)

• [ ] Yes
• [x] No

The PR fulfills these requirements:

• [x] Schrödinger Hat code of conduct

If adding a new feature, the PR's description includes:

• [x] A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

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