Update to align with the live site at helioviewer.org

* Update readme to remove reference to old wiki and update installation page.
* Return the Credits section of the README.
* Remove empty files...

README.txt

@@ -9,10 +9,6 @@ To request a new feature or to report a bug, visit
 
     https://github.com/Helioviewer-Project
 
-For the most up-to-date documentation on Helioviewer.org and related efforts,
-see the official wiki at
-
-    http://wiki.helioviewer.org/wiki/
 
 ======================================================================
 
@@ -39,7 +35,7 @@ following software:
 INSTALLATION:
 
 Instructions for installing Helioviewer.org are available online at
-http://wiki.helioviewer.org/wiki/Installing_Helioviewer.org
+https://helioviewer-project.github.io/install/
 
 LICENSE:
 
@@ -52,8 +48,7 @@ CREDITS:
 
 Helioviewer.org is part of the Helioviewer Project, an open-source project
 for the visualization of solar and heliospheric data.  The Helioviewer
-Project is funded by ESA and NASA.  For more information, please see the
-wiki above.
+Project is funded by ESA and NASA.
 
 Helioviewer.org acknowledges the support of the following instrument teams,
 mission teams and institutions - SDO(NASA), SOHO(ESA/NASA), STEREO(NASA),
@@ -63,4 +58,4 @@ Belgium, LMSAL, SDAC, Stanford University, Montana State University/FFT
 Helioviewer.org acknowledges the use of the following tools:
  - www.browserstack.com, for testing the web application on multiple browsers
    and OSs,
- - www.highcharts.com, for interactive JavaScript charts.
+ - www.highcharts.com, for interactive JavaScript charts.

dialogs/about.php

@@ -37,6 +37,16 @@
         <b>Helioviewer.org makes use of the following tools:</b><br />
         <a href="https://www.browserstack.com/" target="_blank">BrowserStack</a> - Cross Browser Testing Tool.<br/>
         <a href="http://www.highcharts.com/" target="_blank">Highcharts</a> - Interactive JavaScript charts for your webpage.<br/>
-
+	<a href="https://sunpy.org/" target="_blank">SunPy</a> - Solar data analysis environment for Python. <br/>
+        <a href="https://github.com/nikolaposa/rate-limit" target="_blank">Rate-Limit</a> - API level rate-limiting by Nikola Posa. <br/>
+        <a href="https://redis.io/" target="_blank">Redis</a> - Open source (BSD licensed), in-memory data structure store. <br/>
+    </span>
+    <br/>
+    <span style="margin-left:auto; margin-right: auto;">
+        <b>YouTube API Client Acknowledgements:</b><br />
+        <a href="https://www.youtube.com/terms" target="_blank">YouTube Terms of Service (ToS)</a> <br/>
+        <a href="https://policies.google.com/privacy" target="_blank">Google Privacy Policy</a> <br/>
+        <a href="https://security.google.com/settings/security/permissions" target="_blank">Revoke YouTube API Access for Helioviewer.org</a> <br/>
+    
     </span>
 </div>