Is your feature request related to a problem? Please describe.
I use theme-ui on daily basis on personal and work projects. The documentation is quite large and I just want to remember something that I used before so I navigate the whole docs to get it.

Adding search in docs page will make it easy to remember things fast instead of navigating the documentation.

**Describe the solution

Recently @devrnt opened up a PR to improve the setup with a theme(#189) and I realised that it'll be awesome to have that section expanded for each case.

https://github.com/ocsigen/tyxml

One of the promoted features is that this works out of the box with SSR. I took that to mean that when javascript is off the components will still be visible so that crawlers can read the page. If that assumption is incorrect then skip the rest.

I followed the documentation, animation works great.

<Fade>
    <div>My content</div>
</Fade>

but when I turn off javascript t