docs(fix): revert prettier formatting on markdown files (#1612)

Prettier formatting our markdown files is causing bugs because of the
differences between Gatsby's parser and Prettier's. Also, Prettier
formats the inline code-blocks containing example CMS configs, but the
formatting it uses doesn't really make much sense or match the suggested
CMS config style.

It doesn't actually make much sense to format the docs anyway, since we
use the CMS itself to edit/generate them.

website/data/notifications.yml

@@ -1,29 +1,28 @@
 notifications:
-  - loud: true
-    message: >-
-      Register to join us online for our next community dev meeting, every other
-      Wednesday at 9am-10am PT!
-    published: false
-    title: Netlify CMS Development Planning Sessions Promo
-    url: >-
-      https://www.eventbrite.com/e/netlify-cms-planning-session-bi-weekly-tickets-35794058994
-  - loud: true
-    message: >-
-      We have a community on Gitter - join now to ask questions and discuss the
-      project with other devs!
-    published: false
-    title: Gitter shoutout
-    url: 'https://gitter.im/netlify/netlifycms'
-  - loud: true
-    message: >-
-      Netlify CMS now supports GitLab!
-    published: false
-    title: GitLab announcement
-    url: '/blog/2018/06/netlify-cms-now-supports-gitlab-as-a-backend/'
-  - loud: true
-    message: >-
-      Announcing 2.0 - Bitbucket support and monorepo architecture!
-    published: true
-    title: 2.0 announcement
-    url:
-      '/blog/2018/07/netlify-cms-2-0-launches-with-bitbucket-support-and-a-new-monorepo-architecture'
+- loud: true
+  message: >-
+    Register to join us online for our next community dev meeting, every other
+    Wednesday at 9am-10am PT!
+  published: false
+  title: Netlify CMS Development Planning Sessions Promo
+  url: >-
+    https://www.eventbrite.com/e/netlify-cms-planning-session-bi-weekly-tickets-35794058994
+- loud: true
+  message: >-
+    We have a community on Gitter - join now to ask questions and discuss the
+    project with other devs!
+  published: false
+  title: Gitter shoutout
+  url: 'https://gitter.im/netlify/netlifycms'
+- loud: true
+  message: >-
+    Netlify CMS now supports GitLab!
+  published: false
+  title: GitLab announcement
+  url: '/blog/2018/06/netlify-cms-now-supports-gitlab-as-a-backend/'
+- loud: true
+  message: >-
+    Announcing 2.0 - Bitbucket support and monorepo architecture!
+  published: true
+  title: 2.0 announcement
+  url: '/blog/2018/07/netlify-cms-2-0-launches-with-bitbucket-support-and-a-new-monorepo-architecture'