Added `noscript` `img` so Image will show up if js disabled
Added `noscript` `img` so Image will show up if js disabled

Added <img /> tag wrapped with <noscript /> in case js is not enabled but image will still show up. The element would look like this:

```
<amp-img ...>
<noscript>
<img ... />
</noscript>
</ampimg ...>
```
Duplicate amp-img, remove layout attribut, wrap it with noscript, and add it as amp-img child
juusaw/amp-jekyll,juusaw/amp-jekyll