Move all files to 2017/

2017/web/themes/dcb2017/sass/base/_mixins.scss

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+// Tablet size breakpoint 600px.
+@mixin media-tablet {
+  @media screen and (min-width: 37.5rem) {
+    @content;
+  }
+}
+
+// Desktop size breakpoint 900px.
+@mixin media-large {
+  @media screen and (min-width: 56.25rem) {
+    @content;
+  }
+}
+
+// Wide Desktop size breakpoint 1200px.
+@mixin media-wide {
+  @media screen and (min-width: 75rem) {
+    @content;
+  }
+}
+
+@mixin button {
+  background: $dcb-blue;
+  border: 0;
+  color: white;
+  font-size: 1rem;
+  font-weight: 600;
+  padding: 0.5rem 1rem;
+  text-decoration: none;
+  text-transform: uppercase;
+
+  &:hover,
+  &:focus {
+    background: $dcb-green;
+  }
+}

2017/web/themes/dcb2017/sass/base/_variables.scss

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+// Custom variables, colours etc.
+
+$dcb-green: #0fa877;
+$dcb-blue: #b33ee9;
+$dcb-purple: #ec16a8;
+
+$dcb-grey: #666;