Move gh-pages branch files into /docs and add test files

- Jekyll ignore `/docs` and `/test` folders when using from root
- Update Staticman config to point to correct branch and data file location
- Replace `{{ base_path }}` references with `absolute_url` filter
- Update documentation

docs/_sass/vendor/breakpoint/_settings.scss

@@ -0,0 +1,71 @@
+//////////////////////////////
+// Has Setting
+//////////////////////////////
+@function breakpoint-has($setting) {
+  @if map-has-key($breakpoint, $setting) {
+    @return true;
+  }
+  @else {
+    @return false;
+  }
+}
+
+//////////////////////////////
+// Get Settings
+//////////////////////////////
+@function breakpoint-get($setting) {
+  @if breakpoint-has($setting) {
+    @return map-get($breakpoint, $setting);
+  }
+  @else {
+    @return map-get($Breakpoint-Settings, $setting);
+  }
+}
+
+//////////////////////////////
+// Set Settings
+//////////////////////////////
+@function breakpoint-set($setting, $value) {
+  @if (str-index($setting, '-') or str-index($setting, '_')) and str-index($setting, ' ') == null {
+    @warn "Words in Breakpoint settings should be separated by spaces, not dashes or underscores. Please replace dashes and underscores between words with spaces. Settings will not work as expected until changed.";
+  }
+  $breakpoint: map-merge($breakpoint, ($setting: $value)) !global;
+  @return true;
+}
+
+@mixin breakpoint-change($setting, $value) {
+  $breakpoint-change: breakpoint-set($setting, $value);
+}
+
+@mixin breakpoint-set($setting, $value) {
+  @include breakpoint-change($setting, $value);
+}
+
+@mixin bkpt-change($setting, $value) {
+  @include breakpoint-change($setting, $value);
+}
+@mixin bkpt-set($setting, $value) {
+  @include breakpoint-change($setting, $value);
+}
+
+//////////////////////////////
+// Remove Setting
+//////////////////////////////
+@function breakpoint-reset($settings...) {
+  @if length($settings) == 1 {
+    $settings: nth($settings, 1);
+  }
+
+  @each $setting in $settings {
+    $breakpoint: map-remove($breakpoint, $setting) !global;
+  }
+  @return true;
+}
+
+@mixin breakpoint-reset($settings...) {
+  $breakpoint-reset: breakpoint-reset($settings);
+}
+
+@mixin bkpt-reset($settings...) {
+  $breakpoint-reset: breakpoint-reset($settings);
+}