Add link to front page

[slowe]

Once everything else is done and it is ready, we need to add a new link to the index page.

[slowe]

To add the "DFES 2020" box to the front page, start editing the main index.html. You'll notice a section that looks like this:

<ul class="grid">
	<li><a href="2020-emerging-thinking/index.html" class="deep-electrification">Emerging Thinking 2020<br /><time>September 2020</time></a></li>
	<li><a href="2019-DFES/index.html" class="c9-bg">Future Energy Scenarios 2019<br /><time>December 2019</time></a></li>
</ul>

You should replace that with:

<ul class="grid">
	<li><a href="2020-DFES/index.html" class="steady-progression">Future Energy Scenarios 2020<br /><time>December 2020</time></a></li><li><a href="2020-emerging-thinking/index.html" class="deep-electrification">Emerging Thinking 2020<br /><time>September 2020</time></a></li>
	<li><a href="2020-emerging-thinking/index.html" class="deep-electrification">Emerging Thinking 2020<br /><time>September 2020</time></a></li>
	<li><a href="2019-DFES/index.html" class="c9-bg">Future Energy Scenarios 2019<br /><time>December 2019</time></a></li>
</ul>

Then save it.

[slowe]

This is required to be added this week by @mary-black