docs: Update release notes, index, and calendar for 19.3.0

docs/index.html

 
 <h1>News</h1>
 
-<h2>December 4, 2019</h2><p><a href="relnotes/19.2.7.html">Mesa 19.2.7</a> is released. This is a bug fix release.</p><h2>November 21, 2019</h2><p><a href="relnotes/19.2.6.html">Mesa 19.2.6</a> is released. This is a bug fix release.</p><h2>November 20, 2019</h2><p><a href="relnotes/19.2.5.html">Mesa 19.2.5</a> is released. This is a bug fix release.</p><h2>November 13, 2019</h2><p><a href="relnotes/19.2.4.html">Mesa 19.2.4</a> is released. This is an emergency bugfix release, all users of 19.2.3 are recomended to upgrade immediately.</p>
+<h2>December 12, 2019</h2><p><a href="relnotes/19.3.0.html">Mesa 19.3.0</a> is released. This is a new development release. See the release notes for mor information about this release.</p><h2>December 4, 2019</h2><p><a href="relnotes/19.2.7.html">Mesa 19.2.7</a> is released. This is a bug fix release.</p><h2>November 21, 2019</h2><p><a href="relnotes/19.2.6.html">Mesa 19.2.6</a> is released. This is a bug fix release.</p><h2>November 20, 2019</h2><p><a href="relnotes/19.2.5.html">Mesa 19.2.5</a> is released. This is a bug fix release.</p><h2>November 13, 2019</h2><p><a href="relnotes/19.2.4.html">Mesa 19.2.4</a> is released. This is an emergency bugfix release, all users of 19.2.3 are recomended to upgrade immediately.</p>
 <h2>November 6, 2019</h2><p><a href="relnotes/19.2.3.html">Mesa 19.2.3</a> is released. This is a bug fix release.</p><h2>October 24, 2019</h2><p><a href="relnotes/19.2.2.html">Mesa 19.2.2</a> is released. This is a bug fix release.</p><h2>October 21, 2019</h2>
 <p>
 <a href="relnotes/19.1.8.html">Mesa 19.1.8</a> is released.

docs/release-calendar.html

 <td>Last planned 19.2.x release</td>
 </tr>
 <tr>
-<td rowspan="1">19.3</td>
-<td>2019-12-11</td>
-<td>19.3.0-rc7</td>
+<td rowspan="4">19.3</td>
+<td>2019-12-18</td>
+<td>19.3.1</td>
+<td>Dylan Baker</td>
+<td>If there is interest</td>
+</tr>
+<tr>
+<td>2020-01-08</td>
+<td>19.3.2</td>
+<td>Dylan Baker</td>
+<td/>
+</tr>
+<tr>
+<td>2020-01-22</td>
+<td>19.3.3</td>
+<td>Dylan Baker</td>
+<td/>
+</tr>
+<tr>
+<td>2020-02-05</td>
+<td>19.3.4</td>
 <td>Dylan Baker</td>
-<td>Last planned RC/Final release</td>
+<td/>
 </tr>
 </table>
 

docs/relnotes.html

 </p>
 
 <ul>
-<li><a href="relnotes/19.2.7.html">19.2.7 release notes</a></li><li><a href="relnotes/19.2.6.html">19.2.6 release notes</a></li><li><a href="relnotes/19.2.5.html">19.2.5 release notes</a></li><li><a href="relnotes/19.2.4.html">19.2.4 release notes</a></li><li><a href="relnotes/19.2.3.html">19.2.3 release notes</a></li><li><a href="relnotes/19.2.2.html">19.2.2 release notes</a></li><li><a href="relnotes/19.1.8.html">19.1.8 release notes</a>
+<li><a href="relnotes/19.3.0.html">19.3.0 release notes</a></li><li><a href="relnotes/19.2.7.html">19.2.7 release notes</a></li><li><a href="relnotes/19.2.6.html">19.2.6 release notes</a></li><li><a href="relnotes/19.2.5.html">19.2.5 release notes</a></li><li><a href="relnotes/19.2.4.html">19.2.4 release notes</a></li><li><a href="relnotes/19.2.3.html">19.2.3 release notes</a></li><li><a href="relnotes/19.2.2.html">19.2.2 release notes</a></li><li><a href="relnotes/19.1.8.html">19.1.8 release notes</a>
 </li><li><a href="relnotes/19.2.1.html">19.2.1 release notes</a></li><li><a href="relnotes/19.2.0.html">19.2.0 release notes</a>
 </li><li><a href="relnotes/19.1.7.html">19.1.7 release notes</a>
 </li><li><a href="relnotes/19.1.6.html">19.1.6 release notes</a>