[Doc] Update documentation structure and content

[LeiWang1999]

This pull request includes significant updates to the documentation configuration and content for the Tile Language project. The changes involve updating the Sphinx configuration, adding new documentation sections, and reorganizing existing documentation files.

Updates to Sphinx configuration:

• docs/conf.py: Changed the theme from sphinx_rtd_theme to furo and updated the html_static_path to include _static. Added sphinx.ext.mathjax and sphinx.ext.autosummary to the extensions list. Commented out imports and paths related to tlcpack_sphinx_addon. [1] [2] [3] [4] [5]

New documentation content:

• docs/get_started/overview.rst: Added a comprehensive overview of the Tile Language, including sections on programming interfaces, compilation flow, tile-based programming model, and explicit hardware memory allocation.

Reorganization of documentation files:

• docs/index.rst: Updated the table of contents to include new sections for "GET STARTED" and "LANGUAGE REFERENCE," and added links to the new and reorganized documentation files.
• docs/language_ref/ast.rst: Added a new section for the Tile Language Abstract Syntax Tree (AST).
• docs/language_ref/primitives.rst: Added a new section for Tile Language primitives.
• docs/language_ref/tilelibrary.rst: Renamed from docs/get_started/language_ref.rst and updated the content to focus on the Tile Library.

Updates to documentation dependencies:

• docs/requirements.txt: Removed sphinx-rtd-theme and tlcpack-sphinx-addon, and added furo as the new Sphinx theme.…n, revise project name, and change theme to Furo