redo hella docs scss

- clean out commented out code
- break apart homepage.scss into sub files by component
- rename a few files to reflect their new component names

docs/assets/scss/_nav.scss

@@ -0,0 +1,25 @@
+//
+// Main navbar
+//
+
+.bd-navbar {
+  padding-top: 1rem;
+  padding-bottom: 1rem;
+  margin-bottom: 0;
+  // background-color: $bd-graphite;
+
+  .nav-link {
+    color: $bd-graphite-light;
+
+    &.active,
+    &:hover,
+    &:focus {
+      color: $gray-dark;
+      background-color: transparent;
+    }
+
+    &.active {
+      font-weight: 500;
+    }
+  }
+}