update docs theme

Author: ansibleguy

docs/requirements.txt

@@ -1,3 +1,3 @@
 # pip requirements to build docs
 sphinx
-sphinx-rtd-theme
+piccolo_theme

docs/source/conf.py

@@ -5,10 +5,10 @@
 project = 'Ansible Collection - Systemd'
 copyright = f'{datetime.now().year}, AnsibleGuy'
 author = 'AnsibleGuy'
-extensions = ['sphinx_rtd_theme']
+extensions = ['piccolo_theme']
 templates_path = ['_templates']
 exclude_patterns = []
-html_theme = 'sphinx_rtd_theme'
+html_theme = 'piccolo_theme'
 html_static_path = ['_static']
 html_logo = 'https://brand.systemd.io/assets/svg/systemd-dark.svg'
 html_favicon = '_static/img/favicon.png'
@@ -20,3 +20,4 @@
     '.rst': 'restructuredtext',
 }
 html_theme_options = {}
+html_short_title = 'Ansible Systemd'