Fix SSL Warning on Website

Visitors to melbournehousesitters.com.au are being greeted by an “dangerous site” alert, and it’s driving them away before they even see the content. I have not touched the code or updated anything recently, so the problem is likely server-side or certificate-related... (Budget: $10 - $30 AUD, Jobs: DNS, Linux, PHP, SSL, Web Development, Web Hosting, Web Security, Website Design, Website Management, Website Optimization)