(demo) Introduce new demos for basic + workbox usage

* upload news with quicklink and news with workbox

* added service worker to news-workbox

* added readme to news and news-workbox demos

* added menu links pages

* removed source from demos and left just readmes

* updated readmes according to the suggestions but domain name not modified

Author: anton-karlovskiy

demos/news-workbox/README.md

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+
+# Demo: Quicklink usage with workbox
+A demo showing how to use Quicklink with Workbox for offline caching and links in the visible viewport.
+
+## Glitch Source
+* [Link to Glitch App](https://anton-karlovskiy-quicklink-news-workbox.glitch.me)
+* [Link to Project on Glitch](https://glitch.com/~anton-karlovskiy-quicklink-news-workbox)
+
+## Installation
+```
+git clone https://api.glitch.com/git/anton-karlovskiy-quicklink-news-workbox
+npm install
+npm start
+npm run build
+```

demos/news/README.md

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+
+# Demo: Quicklink basic usage
+A demo showing how to use Quicklink on a simple multi-page website.
+
+## Glitch Source
+* [Link to Glitch App](https://anton-karlovskiy-quicklink-news.glitch.me)
+* [Link to Project on Glitch](https://glitch.com/~anton-karlovskiy-quicklink-news)
+
+## Installation
+```
+git clone https://api.glitch.com/git/anton-karlovskiy-quicklink-news
+npm install
+npm start
+npm run build
+```