Fix Sphinx theme loading by removing invalid import

The issue was that conf.py was trying to import sphinx_rtd_theme as a module
from the local directory, which doesn't work with modern Sphinx versions.

Changes:
- Removed: sys.path.insert for sphinx_rtd_theme directory
- Removed: import sphinx_rtd_theme (invalid with local theme)
- Added: html_theme_path = ["."] to point to local theme directory

Now Sphinx will find the local sphinx_rtd_theme/ directory without the
problematic import statement that was causing 'no setup() function' error.

Error was: 'extension sphinx_rtd_theme has no setup() function'

Author: RoryBarnes

docs/conf.py

@@ -14,8 +14,6 @@
 import sys
 
 sys.path.insert(0, os.path.abspath("."))
-sys.path.insert(0, os.path.abspath("sphinx_rtd_theme"))
-import sphinx_rtd_theme
 
 # -- Project information -----------------------------------------------------
 
@@ -50,6 +48,7 @@
 # a list of builtin themes.
 #
 html_theme = "sphinx_rtd_theme"
+html_theme_path = ["."]
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".