Fix sphinx config

Fix the path import path so that peekaboo constants are imported from
the source and sphinx can create the documentation without peekaboo
being installed (in the same virtual environment).

Whiel at it, silence two deprecation warnings.

docs/source/conf.py

@@ -19,7 +19,7 @@
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-sys.path.insert(0, os.path.abspath('..'))
+sys.path.insert(0, os.path.abspath('../..'))
 
 import peekaboo
 
@@ -132,10 +132,6 @@
 # using the given strftime format.
 html_last_updated_fmt = '%b %d, %Y'
 
-# If true, SmartyPants will be used to convert quotes and dashes to
-# typographically correct entities.
-html_use_smartypants = True
-
 # Custom sidebar templates, maps document names to template names.
 html_sidebars = {}
 
@@ -205,7 +201,7 @@
 # latex_show_pagerefs = False
 
 # If true, show URL addresses after external links.
-latex_show_urls = False
+latex_show_urls = 'footnote'
 
 # Documents to append as an appendix to all manuals.
 # latex_appendices = []