[Add] netlify cms

static/admin/config.yml

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+backend:
+  name: git-gateway
+  branch: main
+
+publish_mode: editorial_workflow
+
+media_folder: "static/images"
+public_folder: "images"
+
+collections:
+  - name: "post"
+    label: "Post"
+    folder: "content/post"
+    create: true
+    slug: "{{year}}-{{month}}-{{day}}-{{slug}}"
+    fields:
+      - { label: "Title", name: "title", widget: "string" }
+      - { label: "Publish Date", name: "date", widget: "datetime" }
+      - { label: "Image", name: "image", widget: "image", required: false }
+      - { label: "Intro Blurb", name: "description", widget: "text" }
+      - { label: "Type", name: "type", widget: "select",options: [ "post" ], default: "post" }
+      - { label: "Body", name: "body", widget: "markdown" }

static/admin/index.html

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+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8"/>
+  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+  <title>Content Manager</title>
+</head>
+<body>
+<!-- Include the script that builds the page and powers Netlify CMS -->
+<script src="https://unpkg.com/netlify-cms@^2.0.0/dist/netlify-cms.js"></script>
+</body>
+</html>