remove apiRef register, pr fixes

Signed-off-by: Alex Rybchenko <arybchenko@box.com>

plugins/gcalendar/.eslintrc.js

@@ -1,3 +1 @@
-module.exports = {
-  extends: [require.resolve('@backstage/cli/config/eslint')],
-};
+module.exports = require('@backstage/cli/config/eslint-factory')(__dirname);

plugins/gcalendar/README.md

@@ -4,7 +4,8 @@ Plugin displays events from google calendar
 
 ## Getting started
 
-The plugin exports a `gcalendarApiRef`. Add this to the App's `apis.ts`:
+The plugin exports `HomePageCalendar` widget for the Homepage.
+If your homepage is not static JSX add `gcalendarApiRef` to the App's `apis.ts`:
 
 ```ts
 import {

plugins/gcalendar/package.json

@@ -9,6 +9,9 @@
     "main": "dist/index.esm.js",
     "types": "dist/index.d.ts"
   },
+  "backstage": {
+    "role": "frontend-plugin"
+  },
   "scripts": {
     "start": "backstage-cli package start",
     "build": "backstage-cli package build",
@@ -16,8 +19,7 @@
     "test": "backstage-cli package test",
     "lint": "backstage-cli package lint",
     "prepack": "backstage-cli package prepack",
-    "postpack": "backstage-cli package postpack",
-    "diff": "backstage-cli plugin:diff"
+    "postpack": "backstage-cli package postpack"
   },
   "dependencies": {
     "@backstage/core-components": "^0.9.1",