move contexts all out in own toplevel dir

- rename wizard to book

components/book/index.tsx

@@ -0,0 +1,50 @@
+import React, { useContext } from 'react'
+import Contact from './contact'
+import BookStore, { BookContext } from '../../context/book'
+import DateSelect from './dateSelect'
+import Reason from './reason'
+
+function BookForm() {
+  const { onSubmit, state, forgetData } = useContext(BookContext)
+  const { postData, postDataError, dataStoredLoaded } = state
+
+  return (
+    <>
+      <form
+        className="form"
+        onSubmit={(event) => {
+          event.preventDefault()
+          onSubmit()
+        }}
+      >
+        <DateSelect />
+        <Reason />
+        {dataStoredLoaded && (
+          <p className="mb-6 info-message">
+            Buchungsdaten wurden aus Deinem Browser geladen und vorausgefüllt.{' '}
+            <a className="link" onClick={forgetData}>
+              Daten wieder vergessen
+            </a>
+          </p>
+        )}
+        <Contact />
+        <div className="flex items-end">
+          <button type="submit" disabled={postData} className="btn btn-blue">
+            {postData ? 'Speichern...' : 'Absenden'}
+          </button>
+          {postDataError && (
+            <div className="error-message flex-grow">{postDataError}</div>
+          )}
+        </div>
+      </form>
+    </>
+  )
+}
+
+export default function Book() {
+  return (
+    <BookStore>
+      <BookForm />
+    </BookStore>
+  )
+}