fix all UI snags

[David Leuliette]

• I would say it lacks a bit of space (between the subtitle and the search bar, the left menu, and the content).
• The font size is a bit too big for my taste.
• The colors of the menu are a bit "Christmas tree" for my taste, and they are not found elsewhere, something more neutral could be nice.
• Create a Pricing component
• The filters on the left, when active, do not change their design. They require a style (a border with a darker color or something else) to distinguish them from inactive filters.
• The Reset button should have a different style. It blends too much with the filters, in my opinion.