Fix Sphinx warning due to _static directory

Also:
- Made alias_startup.py example robust as to what directory it is launched from

Author: tleonhardt

docs/conf.py

@@ -102,7 +102,7 @@
 # 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".
-html_static_path = ['_static']
+html_static_path = []
 
 
 # -- Options for HTMLHelp output ------------------------------------------

examples/alias_startup.py

@@ -4,14 +4,15 @@
     1) How to add custom command aliases using the alias command
     2) How to load an initialization script at startup
 """
-
+import os
 import cmd2
 
 class AliasAndStartup(cmd2.Cmd):
     """ Example cmd2 application where we create commands that just print the arguments they are called with."""
 
     def __init__(self):
-        super().__init__(startup_script='.cmd2rc')
+        alias_script = os.path.join(os.path.dirname(__file__), '.cmd2rc')
+        super().__init__(startup_script=alias_script)
 
 
 if __name__ == '__main__':