[docs] Set up documentation structure with API reference

docs/source/api.rst

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+API Reference
+=============
+
+This section provides detailed API documentation for the TexTeller package. TexTeller is a tool for detecting and recognizing LaTeX formulas in images and converting mixed text and formula images to markdown.
+
+.. contents:: Table of Contents
+   :local:
+   :depth: 2
+
+
+Image to LaTeX Conversion
+-------------------------
+
+.. autofunction:: texteller.api.img2latex
+
+Paragraph to Markdown Conversion
+------------------------------
+
+.. autofunction:: texteller.api.paragraph2md
+
+LaTeX Detection
+---------------
+
+.. autofunction:: texteller.api.detection.latex_detect
+
+Model Loading
+-------------
+
+.. autofunction:: texteller.api.load_model
+.. autofunction:: texteller.api.load_tokenizer
+.. autofunction:: texteller.api.load_latexdet_model
+.. autofunction:: texteller.api.load_textdet_model
+.. autofunction:: texteller.api.load_textrec_model
+
+
+KaTeX Conversion
+----------------
+
+.. autofunction:: texteller.api.to_katex

docs/source/conf.py

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+# Configuration file for the Sphinx documentation builder.
+#
+# This file only contains a selection of the most common options. For a full
+# list see the documentation:
+# https://www.sphinx-doc.org/en/master/usage/configuration.html
+
+# -- Path setup --------------------------------------------------------------
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute.
+import os
+import sys
+
+sys.path.insert(0, os.path.abspath('../..'))
+
+# -- Project information -----------------------------------------------------
+
+project = 'TexTeller'
+copyright = '2025, TexTeller Team'
+author = 'TexTeller Team'
+
+# -- General configuration ---------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
+
+extensions = [
+    'myst_parser',
+    'sphinx.ext.duration',
+    'sphinx.ext.intersphinx',
+    'sphinx.ext.autosectionlabel',
+    'sphinx.ext.autodoc',
+    'sphinx.ext.viewcode',
+    'sphinx.ext.napoleon',
+    'sphinx.ext.autosummary',
+    'sphinx_copybutton',
+    # 'sphinx.ext.linkcode',
+    # 'sphinxarg.ext',
+    'sphinx_design',
+    'nbsphinx',
+]
+
+templates_path = ['_templates']
+exclude_patterns = []
+
+# Autodoc settings
+autodoc_member_order = 'bysource'
+add_module_names = False
+autoclass_content = 'both'
+autodoc_default_options = {
+    'members': True,
+    'member-order': 'bysource',
+    'undoc-members': True,
+    'show-inheritance': True,
+    'imported-members': True,
+}
+
+# Intersphinx settings
+intersphinx_mapping = {
+    'python': ('https://docs.python.org/3', None),
+    'numpy': ('https://numpy.org/doc/stable', None),
+    'torch': ('https://pytorch.org/docs/stable', None),
+    'transformers': ('https://huggingface.co/docs/transformers/main/en', None),
+}
+
+html_theme = 'sphinx_book_theme'
+
+html_theme_options = {
+    'repository_url': 'https://github.com/OleehyO/TexTeller',
+    'use_repository_button': True,
+    'use_issues_button': True,
+    'use_edit_page_button': True,
+    'use_download_button': True,
+}
+
+html_logo = "../../assets/logo.svg"

docs/source/index.rst

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+.. TexTeller documentation master file, created by
+   sphinx-quickstart on Sun Apr 20 13:05:53 2025.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+TexTeller Documentation
+===========================================
+
+Features
+--------
+
+- **Image to LaTeX Conversion**: Convert images containing LaTeX formulas to LaTeX code
+- **LaTeX Detection**: Detect and locate LaTeX formulas in mixed text/formula images
+- **Paragraph to Markdown**: Convert mixed text and formula images to Markdown format
+
+Installation
+-----------
+
+You can install TexTeller using pip:
+
+.. code-block:: bash
+
+   pip install texteller
+
+Quick Start
+----------
+
+Converting an image to LaTeX:
+
+.. code-block:: python
+
+   from texteller import load_model, load_tokenizer, img2latex
+
+   # Load models
+   model = load_model(use_onnx=False)
+   tokenizer = load_tokenizer()
+
+   # Convert image to LaTeX
+   latex = img2latex(model, tokenizer, ["path/to/image.png"])[0]
+
+Processing a mixed text/formula image:
+
+.. code-block::python
+
+   from texteller import (
+       load_model, load_tokenizer, load_latexdet_model,
+       load_textdet_model, load_textrec_model, paragraph2md
+   )
+
+   # Load all required models
+   latex_model = load_model()
+   tokenizer = load_tokenizer()
+   latex_detector = load_latexdet_model()
+   text_detector = load_textdet_model()
+   text_recognizer = load_textrec_model()
+
+   # Convert to markdown
+   markdown = paragraph2md(
+       "path/to/mixed_image.png",
+       latex_detector,
+       text_detector,
+       text_recognizer,
+       latex_model,
+       tokenizer
+   )
+
+API Documentation
+----------------
+
+For detailed API documentation, please see :doc:`./api`.
+
+.. toctree::
+   :maxdepth: 2
+   :hidden:
+
+   api