Add newsletter signup to homepage

[K-Ho]

To see how it was implemented in the previous version of the site:

website/index.html

Lines 116 to 126 in 7785b6f

	<div id="mc_embed_signup" style="max-width: 500px; margin: auto">
	<form style="padding: 0" action="https://tech.us12.list-manage.com/subscribe/post?u=605d9798beeb8a1824c8e54e4&amp;id=2bdff54a52" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate>
	<div id="mc_embed_signup_scroll">
	<label for="mce-EMAIL" style="font-size: 0.4em; font-weight: normal; text-align: center">Receive Updates</label>
	<input type="email" style="max-width: 500px;font-family: 'Open Sans', sans-serif; text-align: center; margin:auto; margin-bottom: 10px;" value="" name="EMAIL" class="email" id="mce-EMAIL" placeholder="Your email... ⏎" required>
	<!-- real people should not fill this in and expect good things - do not remove this or risk form bot signups-->
	<div style="position: absolute; left: -5000px;" aria-hidden="true"><input type="text" name="b_605d9798beeb8a1824c8e54e4_2bdff54a52" tabindex="-1" value=""></div>
	<div style="width: 100px; margin: auto;"><input style="margin:auto;font-family: 'Open Sans', sans-serif; font-weight: normal; background: #fff; color: #000;" type="submit" value="Subscribe" name="subscribe" id="mc-embedded-subscribe" class="button"></div>
	</div>
	</form>
	</div>