ISTWCMS-5878 Remove html.inc file which is related to gesso only

includes/html.inc

-<?php
-
-/**
- * @file
- * HTML template functions.
- */
-
-/**
- * Implements hook_preprocess_html().
- */
-function gesso_preprocess_html(&$vars, $hook) {
-  // Add x-ua-compatible meta tag.
-  $vars['page']['#attached']['html_head'][] = [
-    [
-      '#tag' => 'meta',
-      '#attributes' => [
-        'http-equiv' => 'x-ua-compatible',
-        'content' => 'ie=edge',
-      ],
-    ],
-    'x_ua_compatible',
-  ];
-}
-
-/**
- * Implements hook_preprocess_maintenance_page().
- */
-function gesso_preprocess_maintenance_page(&$vars, $hook) {
-  // While markup for normal pages is split into html.html.twig and
-  // page.html.twig, the markup for the maintenance page is all in the single
-  // maintenance-page.html.twig template. So, to have what’s done in
-  // gesso_preprocess_html() and gesso_preprocess_page() also happen
-  // on the maintenance page, it has to be called here.
-  gesso_preprocess_html($vars, $hook);
-  gesso_preprocess_page($vars, $hook);
-}
-
-/**
- * Implements hook_preprocess_page().
- */
-function gesso_preprocess_page(&$vars, $hook) {
-}