feat: add options for branch, local_backend, and publish_mode (editorial flow)

Example for a YAML config:

```
  cms:
    branch: main
    local_backend: true
    publish_mode:
 ```

Close #2124

test/config.yaml

@@ -2,6 +2,7 @@ title: Wowchemy Test
 baseurl:
 module:
   imports:
+    - path: github.com/wowchemy/wowchemy-hugo-modules/wowchemy-cms
     - path: github.com/wowchemy/wowchemy-hugo-modules/wowchemy
 outputs:
   home: [HTML, RSS, JSON, WebAppManifest, headers, redirects]
@@ -14,11 +15,6 @@ params:
   font: native
   main_menu:
     enable: false
-  search:
-    engine: 0
-  security:
-    csp:
-      policy:
-      report_only: false
   cms:
-    branch: master
+    local_backend: true
+    publish_mode:

test/content/admin/index.md

@@ -0,0 +1,7 @@
+---
+# Generate Wowchemy CMS
+type: wowchemycms
+outputs:
+  - wowchemycms_config
+  - HTML
+---

test/content/home/section.md

@@ -1,5 +1,6 @@
 ---
 widget: blank
+widget_id: hello
 headless: true
 weight: 1
 design:

test/go.mod

@@ -2,6 +2,10 @@ module github.com/wowchemy/wowchemy-hugo-modules/test
 
 go 1.15
 
-require github.com/wowchemy/wowchemy-hugo-modules/wowchemy master
+require (
+	github.com/wowchemy/wowchemy-hugo-modules/wowchemy main
+	github.com/wowchemy/wowchemy-hugo-modules/wowchemy-cms main
+)
 
 replace github.com/wowchemy/wowchemy-hugo-modules/wowchemy => ../wowchemy
+replace github.com/wowchemy/wowchemy-hugo-modules/wowchemy-cms => ../wowchemy-cms

test/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "wowchemy-test",
+  "version": "0.0.1",
+  "description": "Wowchemy Test Build",
+  "main": "",
+  "repository": "https://github.com/wowchemy/wowchemy-hugo-modules",
+  "author": "George Cushen",
+  "license": "MIT",
+  "private": true,
+  "scripts": {
+    "view": "hugo server --port 8080 --bind 0.0.0.0",
+    "build": "hugo --minify --cleanDestinationDir --gc --templateMetrics --templateMetricsHints",
+    "cms": "(trap 'kill 0' SIGINT; npx netlify-cms-proxy-server & hugo server --port 8080 --bind 0.0.0.0)"
+  }
+}

test/view.sh

@@ -1 +0,0 @@
-hugo server -p 1330 --minify --templateMetrics --templateMetricsHints