update google-soc/index.html to match google-soc/google-soc.md

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google-soc/index.html

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 <figure>
 <img src="./libigl-logo-python-matlab.jpg" alt="" />
-</figure>
+<figcaption></figcaption></figure>
 
 <p>Libigl is a C++ library, but its functional interface make it very friendly to
 wrapping individual functions for popular scripting languages like Python or
@@ -39,7 +39,7 @@ variety of functions in the library.</p>
 
 <figure>
 <img src="./collapse-split-flip.jpg" alt="" />
-</figure>
+<figcaption></figcaption></figure>
 
 <p>Libigl avoids complicated mesh data-structures to ensure that its interface is
 clean and easy to port into users&#8217; existing projects. Our mesh format is a