add plot styles, clean up package-wide docstrings

doc/index.md

@@ -1,4 +1,4 @@
-# `<project-name>` package docs 
+# `trainlib` package docs 
 {ref}`genindex`
 {ref}`modindex`
 {ref}`search`
@@ -14,7 +14,7 @@
 :maxdepth: 3
 :caption: Autoref
 
-_autoref/<project-name>.rst
+_autoref/index.rst
 ```
 
 ```{toctree}