Add API documentation for statistics (#6364)

This PR adds documentation for api::Statistics and api::Stat, as well as further explanations in sphinx.
It also adds a custom css to our sphinx theme that slightly changes how inline code blocks look.

1 files changed, 11 insertions, 0 deletions

diff --git a/docs/_static/custom.css b/docs/_static/custom.css
new file mode 100644
index 000000000..b2db580ef
--- /dev/null
+++ b/docs/_static/custom.css
@@ -0,0 +1,11 @@
+code {
+    border: 0px !important;
+}
+
+code.xref {
+    color: unset !important;
+}
+
+.rst-content code {
+    padding: 1px !important;
+}