Contact section update

[cattsmall]

This section is also pretty old. The only thing that changed when it was ported to Jekyll is the type of form. The copy could use work, and the form needs validation and spam-blocking capabilities.

@asiahoe @sodevious Feel free to tackle this.

[cattsmall]

Also feel free to implement a different form plugin if you feel like there is one; I went with the one Jekyll suggested, but it's ridiculously barebones...