Correct ORCID + add separate docs and repo URLs (#9)

CITATION.cff

@@ -1,9 +1,12 @@
 cff-version: 1.2.0
 message: "If you use this software, please cite it as below."
+type: software
 authors:
-- family-names: "Graham"
-  given-names: "Matt"
-  orcid: "https://orcid.org/0000-0000-0000-0000"
+  - family-names: Graham
+    given-names: Matthew M.
+    orcid: "https://orcid.org/0000-0001-9104-7960"
+repository-code: "https://github.com/matt-graham/mici"
+url: "https://matt-graham.github.io/mici"
 title: "Mici: Manifold Markov chain Monte Carlo methods in Python"
 keywords:
   - "inference"
@@ -14,4 +17,3 @@ keywords:
   - "HMC"
 doi: 10.5281/zenodo.3517301
 license: MIT
-url: "https://github.com/matt-graham/mici"