please go to your wp-content/plugins folder in the server and rename the Kirki plugin. Try again. If the issue persists, go back to wp-content/plugins folder and rename each plugin at a time. Until the site is online.
Please send us some ftp credentials so we can check it too.
I deleted the original Codeless Builder and Kirki plugins and reinstalled them again from the dashboard. It’s ok now. No errors whatsoever showing. See screenshot: https://ibb.co/vqjpVm6
Adding/updating or removing plugins does not affect any of the content. At max, you will see a bunch of shortcodes, not transformed to elements due to the absence of the plugin, but not a lack of content.
I am not sure what content did you have previously but the slider in the home page is all I saw even before taking actions.
However, you can always import back a back up of the previous page’s state by importing one of the revisions. See screenshot: https://ibb.co/zV2SGVm
