Add: create metadata files for opengfx2_classic (#354)

Without these files, the website cannot generate the download
pages for OpenGFX2-classic.

Author: TrueBrain

_download-meta/opengfx2_classic-nightlies.md

@@ -0,0 +1,2 @@
+---
+---

_download-meta/opengfx2_classic-releases.md

@@ -0,0 +1,2 @@
+---
+---

pages/content-creators.html

@@ -11,7 +11,7 @@ <h3>Gameplay streaming, Let's Play content, and Monetization Guidelines</h3>
     <div class="section-item">
         <div class="content">
             <p>The core game of OpenTTD is released under the GNU General Public License (GPL) version 2.</p>
-            <p>The OpenGFX baseset graphics pack is released under the GNU General Public License version 2.</p>
+            <p>The OpenGFX / OpenGFX2 baseset graphics pack is released under the GNU General Public License version 2.</p>
             <p>The OpenSFX baseset sound effects pack is released under the Creative Commons Attribution-ShareAlike 3.0 Unported license.</p>
             <p>The OpenMSX baseset music pack is released under the GNU General Public License version 2.</p>
             <p>All the above licenses permit use of the software for any purpose, including commercial purposes.</p>