add theme for grand-chatellerault (#43988)

static/grand-chatellerault/_custom.scss

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+#header #top {
+	border-bottom: 3px solid #25aae3;
+}
+
+#header #top #logo a {
+	display: block;
+	height: 120px;
+	line-height: 140px;
+	color: $primary-color;
+	background: url(img/logo.png) 0px 20px no-repeat;
+	padding-top: 15px;
+	text-indent: -10000px;
+	text-transform: uppercase;
+	font-weight: normal;
+}
+
+div.gru-nav > ul > li > a {
+	border-radius: $border-radius;
+	text-transform: uppercase;
+	padding: 2.25em 20px 0em 20px;
+	border-right: 1px solid black;
+	font-size: 120%;
+}
+
+div.gru-nav > ul > li:first-child > a {
+	border-left: 1px solid black;
+}
+
+@media screen and ($max-mobile-viewport) {
+	#header #top #logo a {
+		display: block;
+		overflow: hidden;
+	}
+	div.gru-nav > ul > li > a {
+		font-size: 100%;
+	}
+}
+
+footer .textcell a {
+	color: white;
+}

static/grand-chatellerault/_vars.scss

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+$blue: #126c86;
+$lightblue: #bad9d7;
+$pink: #e53062;
+
+$primary-color: $blue;
+
+$width: 1120px;
+$link-color: $blue;
+$font-color: #666;
+$font-family: Arial, Helvetica, Verdana, sans-serif;
+$nav-submenu-background: #eee;
+$nav-submenu-color: #333;
+$nav-color: black;
+$nav-active-color: $primary-color;
+$nav-item-selected-background: black;
+$nav-item-selected-color: white;
+$nav-item-hover-background: black;
+$nav-item-hover-color: white;
+$border-radius: 2px;
+$button-background: $primary-color;
+$title-background: $pink;
+$title-color: white;
+$nav-mobile-mode: bottom-bar;
+$nav-mobile-bottom-bar-background: #eee;
+
+$cell-border: none;
+$cell-image-position: top;
+$cell-image-padding: none;
+$buttons-order: previous, cancel, submit;

static/grand-chatellerault/config.json

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+{
+  "label": "Grand Châtellerault",
+  "variables": {
+    "pwa_display": "standalone",
+    "theme_color": "#126c86"
+  }
+}

static/grand-chatellerault/style.scss

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+@charset "UTF-8";
+
+@import 'vars';
+@import '../includes/publik';
+@import 'custom';