docs: Use html_css_files

Author: jpmckinney

docs/conf.py

@@ -6,7 +6,7 @@
 import sys
 from pathlib import Path
 
-sys.path.insert(0, Path("..").resolve())
+sys.path.insert(0, str(Path(__file__).parent.parent))
 
 # -- Project information -----------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information
@@ -21,7 +21,10 @@
 # -- General configuration ---------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
 
-extensions = ["myst_parser", "sphinx_design"]
+extensions = [
+    "myst_parser",
+    "sphinx_design",
+]
 
 templates_path = ["_templates"]
 exclude_patterns = ["_build", "Thumbs.db", ".DS_Store"]
@@ -31,6 +34,7 @@
 
 html_theme = "furo"
 html_static_path = ["_static"]
+html_css_files = ["custom.css"]
 
 myst_enable_extensions = ["colon_fence", "deflist", "dollarmath", "tasklist"]
 myst_enable_checkboxes = True