Improvements for the OnlineMall website

The site is built on OpenCart 2.3.0.2.3.

The following work was done on the site:
- redesign of the site pages
- installation of the OCFilter and configuration for the site
- generation of the sitemap.xml
- creation of XML exports for "Epicenter", "Prom.ua", "Rozetka", "Google Merchant", "Kasta"
- optimization of the site according to "Google PageSpeed Insights"
- other tasks related to optimization and functionality