add new theme for castries (#38611)

static/castries-2020/_custom.scss

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+div#page {
+	nav ul {
+		margin-top: 0;
+	}
+}
+
+div#header {
+	padding: 0;
+	background: url(img/BANDEAU.jpg) top right no-repeat;
+	h1 {
+		padding-top: 40px;
+		a {
+			display: block;
+			background: url(img/logo_ville.png) top left no-repeat;
+			height: 120px;
+			text-indent: -1000px;
+			overflow: hidden;
+		}
+	}
+	@media screen and (max-width: $mobile-limit) {
+		background: none;
+		padding-left: 0;
+		a {
+			width: 100%;
+		}
+	}
+}
+
+#footer-wrapper {
+	background: $primary-color url(img/frise-village.jpg) no-repeat top center;
+	background-size: cover;
+	min-height: 300px;
+	#footer {
+		padding-top: 250px;
+		div.textcell a {
+			color: white;
+		}
+	}
+}
+
+@media screen and (max-width: $mobile-limit) {
+	.gru-nav-wrapper {
+		margin-top: -40px;
+	}
+}

static/castries-2020/_vars.scss

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+$primary-color: #005eaa;
+
+$font-color: #0f0f0f;
+$font-size: 16px;
+$font-family: Verdana, sans-serif;
+$width: 1100px;
+$border-radius: 1px;
+$nav-full-width-background: true;
+
+$nav-background: $primary-color;
+$nav-color: white;
+$nav-active-color: darken($nav-background, 10%);
+
+$button-background: $primary-color;
+$title-background: $primary-color;
+$title-color: white;
+$footer-background: #575757;
+$footer-color: white;
+$wcs-step-current-color: $primary-color;

static/castries-2020/config.json

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+{
+  "label": "Castries (2020)",
+  "variables": {
+    "theme_color": "#005eaa"
+  }
+}

static/castries-2020/style.scss

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