migrate signup form from mailerlite to listmonk

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User story

We're migrating from mailerlite to listmonk (news.gfsc.studio)

Acceptance criteria

• [ ] all newsletter signup forms point to listmonk

Implementation notes & questions

existing forms

$rg mailerlite
src/Theme/PageFooter.elm
97:        , action "https://static.mailerlite.com/webforms/submit/g2r6z4"

listmonk provided embed code

<form method="post" action="https://news.gfsc.studio/subscription/form" class="listmonk-form">
    <div>
        <h3>Subscribe</h3>
        <input type="hidden" name="nonce" />
        <p><input type="email" name="email" required placeholder="E-mail" /></p>
        <p><input type="text" name="name" placeholder="Name (optional)" /></p>

        <p>
          <input id="6735a" type="checkbox" name="l" checked value="6735a059-52dd-4843-b76c-4d2b210462d3" />
          <label for="6735a">Trans Dimension</label>
        </p>

        <p><input type="submit" value="Subscribe" /></p>
    </div>
</form>

Implementation plan