More spacing clean up.

Updates margins and padding for headers and form elements.
Corrects selector for sibling heading.
Adds items/show template with updated headings.
Clear item pager.
Make h2 margins and leading more reasonable.
Updates markup and styles for item pager.
Styles for footer.
More consistent styling of items on home page.
More normalization.
Better styles for sort links and pagination.
Specificity to the rescue.