Customization for a Cargo Collective website

We recently launched a new website using a template on Cargo Collectie and would like someone with experience using cargo to add some additional functionality to our site using the custom CSS and HTML editors. Features that we would like include: - we would like to add navigation headers to the top of the page that would allow a user to browse projects by category or tags - buttons with links to facebook, other social media, etc. - icons that would indicate to a user that they must scroll right to see project images - the ability for infinite scrolling