docs(conf): Update for doctest path

Author: tony

docs/conf.py

@@ -8,15 +8,15 @@
 import tmuxp
 
 # Get the project root dir, which is the parent dir of this
-cwd = Path.cwd()
+cwd = Path(__file__).parent
 project_root = cwd.parent
 
 sys.path.insert(0, str(project_root))
 sys.path.insert(0, str(cwd / "_ext"))
 
 # package data
 about = {}
-with open("../tmuxp/__about__.py") as fp:
+with open(project_root / "tmuxp" / "__about__.py") as fp:
     exec(fp.read(), about)
 
 extensions = [