Add Guides Button

[DrewGregory]

I explored 3 potential solutions for embedding guides in our website:

• Iframe in VueJS component. This felt somewhat hacky. I was able to use a postMessage plugin that would handle iframe resizing to give a good scrolling experience, but external links were not supported very well, as it would require the iframe communicating a change in its window.location and have that propagate to the parent window.
• Include the built sphinx html in a VueJS component. Sadly, this would crash webpack (!!!), so I couldn't even test if this works.
• Link to a redirect to the sphinx readthedocs URL via .htaccess, and potentially style the guides to have a similar navbar header to our website for a consistent experience.

I went with bullet 3, and we can ask Stanford IT if we could use a more sophisticated proxy and keep the url under codethechange.stanford.edu/guides as opposed to a redirect.

[DrewGregory]

Update! As per @U8NWXD 's phenomenal suggestion, we actually have a script in Stanford AFS space that just copies the built html from the guides repo and puts in WWW/guides. No .htaccess needed!

[DrewGregory]

Note: I accidentally have Nadin's commits, so merge her stuff first.