LibreJS: Fix Table Formatting

This commit makes the LibreJS table utilize the bootstrap styles
make the table not look absurdly ugly. It also adds table headers,
which is nice 👌

.

In the future, it might be neat to add a test case which loads the
LibreJS parse engine to check for licenses that are not added to the
table. Is there a way to load the IceCat addin in some kind of
headless firefox?
Signed-off-by: Mark Stenglein <mark@stengle.in>

go/go/templates/core/about.html

@@ -121,9 +121,16 @@ SRCT Go • About
 <!-- define the LibreJS License Table -->
 <div class="row">
   <div class="col-md-12">
-    <h4><i class="fa">JavaScript License Information</i></h4>
+    <h4>JavaScript License Information</h4>
     <legend></legend>
-    <table id="jslicense-labels1">
+    <table class="table" id="jslicense-labels1">
+      <thead>
+        <tr>
+          <th>Source File</th>
+          <th>License</th>
+          <th>Uncompressed Source</th>
+        </tr>
+      </thead>
       <tr>
         <td><a href="/static/js/jquery.min.js">jquery.min.js</a></td>
         <td><a href="http://jquery.org/license">Expat</a></td>