Simple Theme example and theme package

examples/theming/.eslintrc.json

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+{
+  "env": {
+    "browser": true
+  },
+  "globals": {
+    "graphql": false
+  }
+}

examples/theming/.gitignore

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+public
+.cache
+node_modules

examples/theming/README.md

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+# theming
+
+https://theming.gatsbyjs.org
+
+Stub README description

examples/theming/blog-posts/my-first-post.mdx

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+# Hi
+
+This is a blog post

examples/theming/gatsby-config.js

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+module.exports = {
+  __experimentalThemes: [[`blog-theme`, { dir: __dirname }]],
+}

examples/theming/package.json

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+{
+  "name": "theming",
+  "private": true,
+  "description": "Gatsby example site using theming",
+  "author": "Chris Biscardi (chris@christopherbiscardi.com)",
+  "dependencies": {
+    "gatsby": "latest",
+    "gatsby-link": "latest"
+  },
+  "license": "MIT",
+  "main": "n/a",
+  "scripts": {
+    "develop": "gatsby develop",
+    "build": "gatsby build"
+  }
+}

examples/theming/src/pages/index.js

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+import React from 'react'
+
+class IndexComponent extends React.Component {
+  render () {
+    return <div>Hello world</div>
+  }
+}
+
+export default IndexComponent

packages/blog-theme/.gitignore

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+/*.js
+!index.js
+yarn.lock

packages/blog-theme/.npmignore

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+# Logs
+logs
+*.log
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directory
+# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git
+node_modules
+*.un~
+yarn.lock
+src
+flow-typed
+coverage
+decls
+examples

packages/blog-theme/README.md

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+# blog-theme
+
+Stub README

packages/blog-theme/index.js

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+// noop

packages/blog-theme/package.json

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+{
+  "name": "blog-theme",
+  "version": "1.0.0",
+  "description": "Stub description for blog-theme",
+  "main": "index.js",
+  "scripts": {
+    "build": "babel src --out-dir . --ignore **/__tests__",
+    "watch": "babel -w src --out-dir . --ignore **/__tests__",
+    "prepare": "cross-env NODE_ENV=production npm run build"
+  },
+  "keywords": [
+    "gatsby",
+    "gatsby-plugin"
+  ],
+  "author": "Chris Biscardi (chris@christopherbiscardi.com)",
+  "bugs": {
+    "url": "https://github.com/gatsbyjs/gatsby/issues"
+  },
+  "homepage": "https://github.com/gatsbyjs/gatsby/tree/master/packages/blog-theme#readme",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/gatsbyjs/gatsby.git"
+  },
+  "license": "MIT",
+  "dependencies": {
+    "@babel/runtime": "^7.0.0",
+    "gatsby-mdx": "0.2.0",
+    "@mdx-js/mdx": "0.15.5",
+    "@mdx-js/tag": "0.15.0",
+    "gatsby-source-filesystem": "2.0.2"
+  },
+  "devDependencies": {
+    "@babel/cli": "^7.0.0",
+    "@babel/core": "^7.0.0",
+    "cross-env": "^5.0.5"
+  }
+}