FEAT: use versioning for frontend (npm) and copy it to lnbits/static/vendor for easier updating (#1590)

* remove static/vendor

* add node dependencies

* add bolt11-decoder

* run npm install inside dockerimage

* only use bundle.js and bundle.css

* use node_modules for bundling vendor assets

* remove dead code

* make argument optional

* reintroduce vendor dir

* reintroduce vendor and single javascript files, minification

* wrong moment, remove minification

* lock packages with non critical issues

* black

lnbits/templates/base.html

@@ -255,6 +255,7 @@
     <!---->
     <script src="/static/js/base.js"></script>
     <script src="/static/js/components.js"></script>
+    <script src="/static/js/bolt11-decoder.js"></script>
     <script type="text/javascript">
       const themes = {{ LNBITS_THEME_OPTIONS  | tojson }}
       const LNBITS_DENOMINATION = {{ LNBITS_DENOMINATION   | tojson}}