Make README badges links.

README.md

@@ -1,12 +1,12 @@
 # OptIK
 
-<p>
-    <img alt="MIT"    src="https://img.shields.io/badge/license-MIT-blue.svg">
-    <img alt="Apache" src="https://img.shields.io/badge/license-Apache-blue.svg">
-    <img alt="CI"     src="https://github.com/kylc/optik/actions/workflows/ci.yaml/badge.svg">
-    <img alt="PyPI"   src="https://img.shields.io/pypi/v/optik-py.svg">
-    <a href="https://zenodo.org/badge/latestdoi/696468110"><img src="https://zenodo.org/badge/696468110.svg" alt="DOI"></a>
-</p>
+<h1>
+    <a href="https://github.com/kylc/optik/blob/master/LICENSE-MIT">    <img alt="MIT"    src="https://img.shields.io/badge/license-MIT-blue.svg">                 </a>
+    <a href="https://github.com/kylc/optik/blob/master/LICENSE-APACHE"> <img alt="Apache" src="https://img.shields.io/badge/license-Apache-blue.svg">              </a>
+    <a href="https://github.com/kylc/optik/actions/workflows/ci.yaml">  <img alt="ci"     src="https://github.com/kylc/optik/actions/workflows/ci.yaml/badge.svg"> </a>
+    <a href="https://pypi.org/project/optik-py/">                       <img alt="PyPI"   src="https://img.shields.io/pypi/v/optik-py.svg">                        </a>
+    <a href="https://zenodo.org/badge/latestdoi/696468110">             <img alt="DOI"    src="https://zenodo.org/badge/696468110.svg">                            </a>
+</h1>
 
 A fast inverse kinematics solver for arbitrary serial chains providing Rust, C++, and Python programming interfaces.