Remove Vue2-based widget (#6610)

* Remove Vue2-based widget

* move floatformat.js

* Delete docready.js

* Update widget.py

src/pretix/static/pretixpresale/js/widget/docready.js

@@ -1,81 +0,0 @@
-// Pure-js replacement for $.ready
-// by John Friend, https://github.com/jfriend00/docReady
-// MIT License
-
-(function (funcName, baseObj) {
-	'use strict'
-	// The public function name defaults to window.docReady
-	// but you can modify the last line of this function to pass in a different object or method name
-	// if you want to put them in a different namespace and those will be used instead of
-	// window.docReady(...)
-	funcName = funcName || 'docReady'
-	baseObj = baseObj || window
-	let readyList = []
-	let readyFired = false
-	let readyEventHandlersInstalled = false
-
-	// call this when the document is ready
-	// this function protects itself against being called more than once
-	function ready () {
-		if (!readyFired) {
-			// this must be set to true before we start calling callbacks
-			readyFired = true
-			for (let i = 0; i < readyList.length; i++) {
-				// if a callback here happens to add new ready handlers,
-				// the docReady() function will see that it already fired
-				// and will schedule the callback to run right after
-				// this event loop finishes so all handlers will still execute
-				// in order and no new ones will be added to the readyList
-				// while we are processing the list
-				readyList[i].fn.call(window, readyList[i].ctx)
-			}
-			// allow any closures held by these functions to free
-			readyList = []
-		}
-	}
-
-	function readyStateChange () {
-		if (document.readyState === 'complete') {
-			ready()
-		}
-	}
-
-	// This is the one public interface
-	// docReady(fn, context);
-	// the context argument is optional - if present, it will be passed
-	// as an argument to the callback
-	baseObj[funcName] = function (callback, context) {
-		if (typeof callback !== 'function') {
-			throw new TypeError('callback for docReady(fn) must be a function')
-		}
-		// if ready has already fired, then just schedule the callback
-		// to fire asynchronously, but right away
-		if (readyFired) {
-			setTimeout(function () { callback(context) }, 1)
-			return
-		} else {
-			// add the function and context to the list
-			readyList.push({ fn: callback, ctx: context })
-		}
-		// if document already ready to go, schedule the ready function to run
-		// IE only safe when readyState is "complete", others safe when readyState is "interactive"
-		if (document.readyState === 'complete' || (!document.attachEvent && document.readyState === 'interactive')) {
-			setTimeout(ready, 1)
-		} else if (!readyEventHandlersInstalled) {
-			// otherwise if we don't have event handlers installed, install them
-			if (document.addEventListener) {
-				// first choice is DOMContentLoaded event
-				document.addEventListener('DOMContentLoaded', ready, false)
-				// backup is window load event
-				window.addEventListener('load', ready, false)
-			} else {
-				// must be IE
-				document.attachEvent('onreadystatechange', readyStateChange)
-				window.attachEvent('onload', ready)
-			}
-			readyEventHandlersInstalled = true
-		}
-	}
-})('docReady', window)
-// modify this previous line to pass in your own method name
-// and object for the method to be attached to