Modification of the site in php

Online store in PHP. Improvements must be made on the test bench. Without Git.
It is necessary:
Improve the main page of the online store (desktop), adding a search icon to the top menu, as well as implementing the mechanics of search results. (Now the search is hidden from the menu and is located at a separate link.) To refine the search itself by changing the data source (from local database search, to JS script).To finalize the display of search buttons and its issuance, it is necessary to refine both for the Desktop and for the Mobile version of the site (the display is slightly different).Modify the main page of the online store (mobile version), adding a logo, with a hyperlink to the main page.Server stack:

Ubuntu 18.04.4 LTS
Nginx 1.14.0
PHP-FPM
PHP 7.2.24
MySQL 5.7.33
Memcache