post: new blog about the themes livestream (#11685)

* post: new blog about the themes livestream

* fix: update local links to be relative

* fix: add title attribute

docs/blog/2019-02-11-gatsby-themes-livestream-and-example/index.md

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+---
+title: >
+  Gatsby Themes: Watch Us Build a Theme Live
+date: 2019-02-11
+author: Jason Lengstorf
+tags:
+  - themes
+  - livestream
+  - tutorials
+---
+
+One of the most exciting things we’re working on at Gatsby right now is themes.
+
+You can find more details in [the announcement post](/blog/2018-11-11-introducing-gatsby-themes/) and [why we think themes are important](/blog/2019-01-31-why-themes/), but the short version is this:
+
+**Gatsby themes allow you to focus only on the parts of the site and app building process that you _need to care about_ by abstracting the rest away into a package.**
+
+What this means in practical terms is that you can use Gatsby themes to create a site with:
+
+- `package.json` with 4 installed packages (`gatsby`, `react`, `react-dom`, and your theme)
+- `gatsby-config.js` with metadata and a reference to your theme
+- a folder full of Markdown files for content
+
+And _that’s it_.
+
+No code. No assembling plugins. Just writing content.
+
+## Learn how to build a Gatsby theme.
+
+Recently I had the pleasure of building a theme from scratch with Gatsby’s own [John Otander](https://twitter.com/4lpine) live on [my weekly livestream](https://twitch.tv/jlengstorf).
+
+<iframe id="ytplayer" title="Theme livestream on YouTube" type="text/html" width="720" height="405"
+src="https://www.youtube.com/embed/?list=PLz8Iz-Fnk_eTpvd49Sa77NiF8Uqq5Iykx&listType=playlist"
+frameborder="0" allowfullscreen />
+
+On the stream, we covered multiple topics:
+
+1. How to build a Gatsby theme from scratch
+2. How to create [child themes](/blog/2019-01-29-themes-update-child-theming-and-component-shadowing/#child-theming)
+3. How to use [component shadowing](/blog/2019-01-29-themes-update-child-theming-and-component-shadowing/#component-shadowing)
+4. How to install and use a Gatsby theme
+
+The code we built is [available on GitHub](https://github.com/jlengstorf/livestream-gatsby-themes) — use it as a starting point to build your own Gatsby themes today!
+
+### Additional Links and Resources
+
+- Post: [Introducing Gatsby Themes](/blog/2018-11-11-introducing-gatsby-themes/)
+- Post: [Why Themes](/blog/2019-01-31-why-themes/)
+- [`gatsby-plugin-page-creator`](/packages/gatsby-plugin-page-creator/)
+- [`gatsby-mdx` getting started docs](https://gatsby-mdx.netlify.com/getting-started)
+- [`gatsby-source-filesystem`](/packages/gatsby-source-filesystem/)
+- [John Otander on Twitter](https://twitter.com/4lpine)
+- [Jason Lengstorf on Twitter](https://twitter.com/jlengstorf)
+
+## Watch future livestreams
+
+If you’re interested in watching more livestreams, I go live every Thursday at 9am Pacific.
+
+[Follow me on Twitch](https://twitch.tv/jlengstorf) to get notified when I go live.