Added GitHub sponsor. (#6)

Author: aryadas98

archive.html

@@ -99,7 +99,7 @@
           <h3>Archive</h3>
           <ul>
             <li><a href="#2017">2017</a></li>
-            <li><a href="#sponsors">Sponsors</a></li>
+            <li><a href="#previous-sponsors">Previous Sponsors</a></li>
           </ul>
 
           <a id="2017"></a>
@@ -347,11 +347,9 @@ <h3>2017</h3>
             </div>
 
           </div>
-          <a id="sponsors"></a>
-          <h3>Sponsors</h3>
-          <a href="https://github.com" target="_blank">
-            <img class="nwoc-sponsor" src="https://cdnjs.cloudflare.com/ajax/libs/octicons/8.0.0/svg/logo-github.svg"/>
-          </a>
+          <a id="previous-sponsors"></a>
+          <h3>Previous Sponsors</h3>
+          <a href="https://www.github.com/" target="_blank"><img class="nwoc-current-sponsors" src="/images/GitHub_Logo_custom.png"/></a>
         </div>
 
         <footer class="mdl-mini-footer">

images/GitHub_Logo_custom.png

@@ -104,6 +104,7 @@
           </div>
           <div class="nwoc-header-sponsors">
               <p>Sponsored By:</p>
+              <a href="https://www.github.com"/ target="_blank"><img src="/images/GitHub_Logo_white_custom.png"/></a>
               <a href="https://www.jetbrains.com/" target="_blank"><img src="/images/jetbrains-variant-2-cropped.png"/></a>
               <a href="https://www.digitalocean.com"/ target="_blank"><img src="/images/DO_Logo_Vertical_White.png"/></a>
           </div>
@@ -231,8 +232,9 @@ <h3>Register</h3>
           <p>Make sure to join the <a href="https://gitter.im/NWoC/NWoC2018" target="_blank">Gitter channel</a>. Also, please read the <a href="/codeofconduct.html">Code of Conduct</a>.</p>
 
           <h3>Sponsors</h3>
+          <a href="https://www.github.com/" target="_blank"><img class="nwoc-current-sponsors" src="/images/GitHub_Logo_custom.png"/></a>
           <a href="https://www.jetbrains.com/" target="_blank"><img class="nwoc-current-sponsors" src="/images/jetbrains-variant-1.png"/></a>
-          <a href="https://www.digitalocean.com" target="_blank"><img class="nwoc-current-sponsors" src="/images/DO_Logo_Vertical_Blue.png"/></a>
+          <a href="https://www.digitalocean.com/" target="_blank"><img class="nwoc-current-sponsors" src="/images/DO_Logo_Vertical_Blue.png"/></a>
 
           <h3>Previous projects</h3>
           <p>NWoC 2017 saw a huge participation of more than 200 students from all across the country. 
@@ -332,12 +334,7 @@ <h3>Previous projects</h3>
           </div>
           <br>
           <p>Check the <a href="/archive.html" target="_blank">Archive</a> for more.</p>
-          <h3>Previous Sponsors</h3>
-          <a href="https://github.com" target="_blank">
-            <img class="nwoc-sponsor" src="https://cdnjs.cloudflare.com/ajax/libs/octicons/8.0.0/svg/logo-github.svg"/>
-          </a>
-          <br>
-          <br>
+          
           <h4>Tell your friends about NWoC</h4>
           <div class="mdl-grid nwoc-manuals">
 		        <div class="mdl-cell mdl-cell--6-col">