Update README badges (#1482)

* replace azure links w/ gh actions links in README

* nix landscape; portrait is better anyway

* nix coveralls; move codecov to build status

Author: kandersolar

.landscape.yml

@@ -28,8 +28,11 @@
     <a href="http://pvlib-python.readthedocs.org/en/stable/">
     <img src="https://readthedocs.org/projects/pvlib-python/badge/?version=stable" alt="documentation build status" />
     </a>
-    <a href="https://dev.azure.com/solararbiter/pvlib%20python/_build/latest?definitionId=4&branchName=master">
-      <img src="https://dev.azure.com/solararbiter/pvlib%20python/_apis/build/status/pvlib.pvlib-python?branchName=master" alt="Azure Pipelines build status" />
+    <a href="https://github.com/pvlib/pvlib-python/actions/workflows/pytest.yml?query=branch%3Amaster">
+      <img src="https://github.com/pvlib/pvlib-python/actions/workflows/pytest.yml/badge.svg?branch=master" alt="GitHub Actions Testing Status" />
+    </a>
+    <a href="https://codecov.io/gh/pvlib/pvlib-python">
+    <img src="https://codecov.io/gh/pvlib/pvlib-python/branch/master/graph/badge.svg" alt="codecov coverage" />
     </a>
   </td>
 </tr>
@@ -44,17 +47,6 @@
     </a>
   </td>
 </tr>
-<tr>
-  <td>Coverage</td>
-  <td>
-    <a href="https://coveralls.io/r/pvlib/pvlib-python">
-    <img src="https://img.shields.io/coveralls/pvlib/pvlib-python.svg" alt="coveralls coverage" />
-    </a>
-    <a href="https://codecov.io/gh/pvlib/pvlib-python">
-    <img src="https://codecov.io/gh/pvlib/pvlib-python/branch/master/graph/badge.svg" alt="codecov coverage" />
-    </a>
-  </td>
-</tr>
 <tr>
   <td>Benchmarks</td>
   <td>