Switch docs guide to new Furo theme (#438)

docs_guide/conf.py

@@ -3,33 +3,25 @@
 # For the full list of built-in configuration values, see the documentation:
 # https://www.sphinx-doc.org/en/master/usage/configuration.html
 
-# -- Project information -----------------------------------------------------
-# https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information
-
 import datetime
 
 project = "Qiskit Docs Guide"
 copyright = f"2022-{datetime.date.today().year}, Qiskit Development Team"
 author = "Qiskit Development Team"
 release = "1.0"
 
-# -- General configuration ---------------------------------------------------
-# https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
-
 extensions = [
     "jupyter_sphinx",
     "sphinx.ext.doctest",
     "sphinx.ext.intersphinx",
     "sphinx_toolbox.confval",
+    "qiskit_sphinx_theme",
 ]
 
 templates_path = ["_templates"]
-
 exclude_patterns = ["_build", "Thumbs.db", ".DS_Store"]
 
-html_theme = "qiskit_sphinx_theme"
-
-# -- Intersphinx configuration ------------------------------------------------
+html_theme = "_qiskit_furo"
 
 intersphinx_mapping = {
     "sphinx": ("https://www.sphinx-doc.org/en/master/", None),