CSS is a big jumbly mess

[mattstratton]

Definitely could use some collapsing.

For example, there are a lot of classes set up for h1 tags on speaker pages, etc, but they don't seem all that different than the main h1 selector.

[mattstratton]

The main reason that I think this is important to fix, is not to be pedantic, but because it makes the SCSS really hard to read, and much tougher to figure out stuff that is duplicated.

Also, I just realized I'm calling colors directly, and it's more useful to do that in SCSS properly.

For example, this is defined: $navbar-light-color: #0082AB;

but all over the place I just refer to the color #0082AB

[mattstratton]

Also worth looking at...in site.scss we import custom-variables.scss before all the bootstrap stuff, which means we cannot override the bootstrap variables. I'm not sure why I made this choice. I should try moving custom-variables.scss after the boostrap one just to see.

[mattstratton]

I was wrong - we need custom-variables.scss after the bootstrap one to over-ride the values.

[mattstratton]

I think that this includes #367