Add comprehensive Sphinx documentation with GitHub Pages deployment

- Complete documentation structure with index, quickstart, examples, and API reference
- Sphinx configuration with RTD theme, MyST parser, and autodoc
- GitHub Actions workflow for automated documentation building and deployment
- Local development tools (Makefile, build scripts)
- Comprehensive examples covering basic usage, security, and performance
- API documentation for core, CLI, and exceptions modules

docs/conf.py

@@ -0,0 +1,90 @@
+# Configuration file for the Sphinx documentation builder.
+
+import os
+import sys
+
+# Add the source directory to the Python path
+sys.path.insert(0, os.path.abspath('../src'))
+
+# Import version from the package
+from tzst import __version__
+
+# -- Project information -----------------------------------------------------
+project = 'tzst'
+copyright = '2025, Xi Xu'
+author = 'Xi Xu'
+release = __version__
+version = __version__
+
+# -- General configuration ---------------------------------------------------
+extensions = [
+    'sphinx.ext.autodoc',
+    'sphinx.ext.napoleon',
+    'sphinx.ext.viewcode',
+    'sphinx.ext.intersphinx',
+    'sphinx.ext.autosummary',
+    'myst_parser',
+]
+
+templates_path = ['_templates']
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+
+# -- Options for HTML output -------------------------------------------------
+html_theme = 'sphinx_rtd_theme'
+html_static_path = ['_static']
+html_title = f'tzst {version} Documentation'
+html_short_title = 'tzst'
+
+# Theme options
+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',
+    'collapse_navigation': True,
+    'sticky_navigation': True,
+    'navigation_depth': 4,
+    'includehidden': True,
+    'titles_only': False
+}
+
+# -- Extension configuration -------------------------------------------------
+autodoc_default_options = {
+    'members': True,
+    'undoc-members': True,
+    'show-inheritance': True,
+    'special-members': '__init__',
+    'exclude-members': '__weakref__'
+}
+
+napoleon_google_docstring = True
+napoleon_numpy_docstring = True
+napoleon_include_init_with_doc = False
+napoleon_include_private_with_doc = False
+napoleon_include_special_with_doc = True
+napoleon_use_param = True
+napoleon_use_rtype = True
+
+# Intersphinx mapping
+intersphinx_mapping = {
+    'python': ('https://docs.python.org/3', None),
+    'zstandard': ('https://python-zstandard.readthedocs.io/en/latest/', None),
+}
+
+# Autosummary
+autosummary_generate = True
+
+myst_enable_extensions = [
+    "colon_fence",
+    "deflist",
+    "fieldlist",
+    "html_admonition",
+    "linkify",
+    "replacements",
+    "smartquotes",
+    "strikethrough",
+    "substitution",
+    "tasklist",
+]