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

examples/demo/views/mixins/forms.pug

@@ -1,25 +0,0 @@
-//- Form input mixins
-
-mixin input(name, label, type, placeholder)
-  .form-group
-    label(for=name)= label
-    input.form-control(type=type id=name name=name placeholder=placeholder)
-
-mixin input-required(name, label, type, placeholder)
-  .form-group
-    label(for=name)
-      = label
-      span.required *
-    input.form-control(type=type id=name name=name placeholder=placeholder required)
-
-mixin select(name, label, options)
-  .form-group
-    label(for=name)= label
-    select.form-control(id=name name=name)
-      each opt in options
-        option(value=opt.value)= opt.label
-
-mixin textarea(name, label, placeholder, rows)
-  .form-group
-    label(for=name)= label
-    textarea.form-control(id=name name=name placeholder=placeholder rows=rows)