Fix naming: org-mode -> Org mode

https://scripter.co/how-do-i-write-org-mode/

Prefer “Org mode” to “Org-mode” or “org-mode”. This is simply because it reflects an existing convention in The Emacs Manual which consistently documents mode names in this form - “Text mode”, “Outline mode”, “Mail mode”, etc.

org/testdata/misc.html

@@ -103,7 +103,7 @@ deploy:
 </ul>
 <h3>
 <span class="todo">DONE</span>
-<a href="https://github.com/chaseadamsio/goorgeous/issues/33">#33</a>: Wrong output when mixing html with org-mode
+<a href="https://github.com/chaseadamsio/goorgeous/issues/33">#33</a>: Wrong output when mixing html with Org mode
 </h3>
 <div class="outline-2" id="meta" style="color: green;">
 <table>

org/testdata/misc.org

@@ -25,7 +25,7 @@ for now files can be included as:
   #+INCLUDE: "./paragraphs.html" export html
 - example block
   #+INCLUDE: "../../.travis.yml" example yaml
-*** DONE [[https://github.com/chaseadamsio/goorgeous/issues/33][#33]]: Wrong output when mixing html with org-mode
+*** DONE [[https://github.com/chaseadamsio/goorgeous/issues/33][#33]]: Wrong output when mixing html with Org mode
 #+HTML: <div class="outline-2" id="meta" style="color: green;">
 | *foo* | foo |
 | *bar* | bar |