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/content/docs/widgets/select.md

@@ -1,5 +1,5 @@
 ---
-label: 'Select'
+label: "Select"
 target: select
 ---
 
@@ -11,22 +11,23 @@ The select widget allows you to pick a single string value from a dropdown menu.
 - **Options:**
   - `default`: accepts a string; defaults to an empty string
   - `options`: (**required**) a list of options for the dropdown menu; can be listed in two ways:
-    - string values: the label displayed in the dropdown is the value saved in the file
-    - object with `label` and `value` fields: the label displays in the dropdown; the value is saved in the file
+      - string values: the label displayed in the dropdown is the value saved in the file
+      - object with `label` and `value` fields: the label displays in the dropdown; the value is saved in the file
 - **Example** (options as strings):
     ```yaml
-    - label: 'Align Content'
-      name: 'align'
-      widget: 'select'
-      options: ['left', 'center', 'right']
+    - label: "Align Content"
+      name: "align"
+      widget: "select"
+      options: ["left", "center", "right"]
     ```
 - **Example** (options as objects):
     ```yaml
-    - label: 'City'
-      name: 'airport-code'
-      widget: 'select'
+    - label: "City"
+      name: "airport-code"
+      widget: "select"
       options:
-        - { label: 'Chicago', value: 'ORD' }
-        - { label: 'Paris', value: 'CDG' }
-        - { label: 'Tokyo', value: 'HND' }
+        - { label: "Chicago", value: "ORD" }
+        - { label: "Paris", value: "CDG" }
+        - { label: "Tokyo", value: "HND" }
     ```
+