www: remov no build step from marketing (denoland#2407)

We've been moving away from that for a couple of months now, so
featuring the "no build step" prominently in our marketing feels wrong.

README.md

@@ -13,7 +13,6 @@ Some stand-out features:
 - Just-in-time rendering on the edge.
 - Island based client hydration for maximum interactivity.
 - Zero runtime overhead: no JS is shipped to the client by default.
-- No build step.
 - No configuration necessary.
 - TypeScript support out of the box.
 - File-system routing à la Next.js.

docs/latest/introduction/index.md

@@ -30,7 +30,6 @@ for the best experience.
 
 Some stand out features:
 
-- No build step
 - Zero config necessary
 - JIT rendering on the edge
 - Tiny & fast (no client JS is required by the framework)

www/routes/index.tsx

@@ -125,13 +125,6 @@ function Features() {
         </div>
       </div>
 
-      <div class={item}>
-        <FeatureIcons.NoBuild />
-        <div class={desc}>
-          <b>No build step</b>.
-        </div>
-      </div>
-
       <div class={item}>
         <FeatureIcons.Garbage />
         <div class={desc}>