Accessibility fixes for create IDs pages

[sfisher]

For both the simple and advanced pages. See #544 .

I had to do quite a bit of HTML and CSS redoing and rearranging to make the order right for screen readers (or pressing tab through all the fields).

The ordering issues.

• Before, the entire form was in-between the simple and advanced tabs in the form.
• The PDFs sidebar was first and they wanted it to go to the end after all the form. This was wonky because the top half of the form is a two column layout (choose an ID and quick start) and the bottom half of the form was a full width full column layout. So either the PDFs were before the entire form or else they'd appear in the middle of the form tab order if doing columns in any normal order. I finally had to do some floats and move things around and do absolute positioning of the PDF/guides to make the source code/tab order be nice for screen readers while looking the same. (I also had to manually simulate the bootstrap widths and columns with css since couldn't get bootstrap to do what I needed.) 🤷‍♂️