Update documentation structure and configuration

Revised Sphinx directives in CLI and exceptions API docs to use ':no-index' instead of ':members', ':undoc-members', and ':show-inheritance'. Removed 'display_version' from Sphinx configuration. Added 'README' to the index page for better navigation.

docs/conf.py

@@ -39,7 +39,6 @@ html_short_title = "tzst"
 html_theme_options = {
     "canonical_url": "https://xixu-me.github.io/tzst/",
     "logo_only": False,
-    "display_version": True,
     "prev_next_buttons_location": "bottom",
     "style_external_links": False,
     "style_nav_header_background": "#2980B9",