[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