Create providers directory; Markdown provider

src/core/components/providers/Markdown.js

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+import Remarkable from "react-remarkable"
+import React from "react"
+
+
+export default ({ source }) => {
+  return <Remarkable
+    options={{html: true, typographer: true, linkify: true, linkTarget: "_blank"}}
+    source={source}
+    ></Remarkable>
+}

src/core/components/providers/README.md

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+# Providers
+
+Providers are generic bridges to third-party components. They provide two benefits:
+
+1. ability for plugins to override third-party components, because providers are loaded through `getComponent`
+2. allows us to avoid painting ourselves into a corner with a third-party component