refactor: move docs and examples to src folder, update README with accurate benchmarks

examples/demo/views/pages/cart.pug

@@ -1,47 +0,0 @@
-extends layouts/base.pug
-
-block title
-  title #{title} | Pugz Store
-
-block content
-  section.page-header
-    .container
-      h1 Shopping Cart
-      p Review your items before checkout
-
-  section.section
-    .container
-      .cart-layout
-        .cart-main
-          .cart-items
-            each item in cartItems
-              .cart-item
-                .cart-item-info
-                  h3 #{name}
-                  p.text-muted #{variant}
-                  span.cart-item-price $#{price}
-                .cart-item-qty
-                  button.qty-btn -
-                  input.qty-input(type="text" value=quantity)
-                  button.qty-btn +
-                .cart-item-total $#{total}
-                button.cart-item-remove x
-
-          .cart-actions
-            a.btn.btn-outline(href="/products") Continue Shopping
-
-        .cart-summary
-          h3 Order Summary
-          .summary-row
-            span Subtotal
-            span $#{subtotal}
-          .summary-row
-            span Shipping
-            span.text-success Free
-          .summary-row
-            span Tax
-            span $#{tax}
-          .summary-row.summary-total
-            span Total
-            span $#{total}
-          a.btn.btn-primary.btn-block(href="/checkout") Proceed to Checkout