docs: update calendar, add news item, and link releases notes for 20.1.1

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5421>

docs/index.html

@@ -16,6 +16,8 @@
 
 <h1>News</h1>
 
+<h2>June 10, 2020</h2>
+<p><a href="relnotes/20.1.1.html">Mesa 20.1.1</a> is released. This is a bug fix release.</p>
 <h2>May 27, 2020</h2>
 <p><a href="relnotes/20.1.0.html">Mesa 20.1.0</a> is released. This is a new development release. See the release notes for more information about this release.</p>
 <h2>May 14, 2020</h2>

docs/release-calendar.html

@@ -66,13 +66,7 @@ if you'd like to nominate a patch in the next stable release.
 <td>Last planned release of the 20.0 series</td>
 </tr>
 <tr>
-<td rowspan="8">20.1</td>
-<td>2020-06-10</td>
-<td>20.1.1</td>
-<td>Eric Engestrom</td>
-<td></td>
-</tr>
-<tr>
+<td rowspan="7">20.1</td>
 <td>2020-06-24</td>
 <td>20.1.2</td>
 <td>Eric Engestrom</td>

docs/relnotes.html

@@ -21,6 +21,7 @@ The release notes summarize what's new or changed in each Mesa release.
 </p>
 
 <ul>
+<li><a href="relnotes/20.1.1.html">20.1.1 release notes</a></li>
 <li><a href="relnotes/20.1.0.html">20.1.0 release notes</a></li>
 <li><a href="relnotes/20.0.7.html">20.0.7 release notes</a></li>
 <li><a href="relnotes/20.0.6.html">20.0.6 release notes</a></li>