Update conf.py

Hide versionchooser, fix sitemap URLs

Author: msbt

docs/conf.py

@@ -1,9 +1,21 @@
 from crate.theme.rtd.conf.sqlalchemy_cratedb import *
 
-
+# Fallback guards, when parent theme does not introduce them.
+if "html_theme_options" not in globals():
+    html_theme_options = {}
 if "intersphinx_mapping" not in globals():
     intersphinx_mapping = {}
 
+# Re-configure sitemap generation URLs.
+# This is a project without versioning.
+sitemap_url_scheme = "{link}"
+
+# Disable version chooser.
+html_context.update({
+    "display_version": False,
+    "current_version": None,
+    "versions": [],
+})
 
 intersphinx_mapping.update({
     'py': ('https://docs.python.org/3/', None),
@@ -12,11 +24,9 @@
     'pandas': ('https://pandas.pydata.org/docs/', None),
     })
 
-
 linkcheck_anchors = True
 linkcheck_ignore = [r"https://github.com/crate/cratedb-examples/blob/main/by-language/python-sqlalchemy/.*"]
 
-
 rst_prolog = """
 .. |nbsp| unicode:: 0xA0
    :trim: