Add manifest.json, icons and install button, flatten client/src

client/js/components/ui/formik/Checkbox.js

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+import React, { memo } from 'react';
+import { FastField } from 'formik';
+import Checkbox from 'components/ui/Checkbox';
+
+const FormikCheckbox = ({ name, onChange, ...props }) => (
+  <FastField
+    name={name}
+    render={({ field, form }) => {
+      return (
+        <Checkbox
+          name={name}
+          checked={field.value}
+          onChange={e => {
+            form.setFieldTouched(name, true);
+            field.onChange(e);
+            if (onChange) {
+              onChange(e);
+            }
+          }}
+          {...props}
+        />
+      );
+    }}
+  />
+);
+
+export default memo(FormikCheckbox);

client/js/components/ui/formik/Error.js

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+import React from 'react';
+import { ErrorMessage } from 'formik';
+
+const Error = props => (
+  <ErrorMessage component="div" className="form-error" {...props} />
+);
+
+export default Error;