Website Repair & SEO Boost

My baby-product site needs a thorough technical tune-up so it can rank and convert better. I want every broken link fixed or redirected, noticeably faster load times, and a layout that responds perfectly on any device... (Budget: $15 - $25 AUD, Jobs: Google PageSpeed Insights, Internet Marketing, Link Building, PHP, SEO, Web Design, Web Development, Website Optimization)