doc: insert logo of Knot into pdf documentation

doc/.gitignore

@@ -15,3 +15,4 @@ texinfo.tex
 version.texi
 mdate-sh
 stamp-vti
+!/logo.pdf
\ No newline at end of file

doc/conf.py.in

@@ -11,7 +11,7 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import sys, os
+import sys, os, time
 
 # 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
@@ -41,7 +41,7 @@ master_doc = 'index'
 
 # General information about the project.
 project = u'Knot DNS'
-copyright = u'2014, CZ.NIC, z.s.p.o.'
+copyright = "%d, CZ.NIC, z.s.p.o." % time.localtime().tm_year
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -110,7 +110,7 @@ html_theme = 'nature'
 
 # The name of an image file (relative to this directory) to place at the top
 # of the sidebar.
-#html_logo = None
+html_logo = 'logo.png'
 
 # The name of an image file (within the static path) to use as favicon of the
 # docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
@@ -195,7 +195,7 @@ latex_documents = [
 
 # The name of an image file (relative to this directory) to place at the top of
 # the title page.
-#latex_logo = None
+latex_logo = 'logo.pdf'
 
 # For "manual" documents, if this is true, then toplevel headings are parts,
 # not chapters.

doc/index.rst

 Welcome to Knot DNS's documentation!
 ====================================
 
-Contents:
-
 .. toctree::
    :maxdepth: 2