documentation fix

[chaoming0625]

Summary by Sourcery

Introduce dynamic version-specific announcement in the documentation and remove legacy version-switching logic and files from the ReadTheDocs configuration.

Enhancements:

• Replace static announcement banner in conf.py with a conditional message linking to either BrainPy 2.0 or 3.0 based on the build_version.

CI:

• Simplify .readthedocs.yml by removing the post_checkout job and always using docs/conf.py for Sphinx configuration.

Documentation:

• Remove the obsolete docs_version2 directory and its associated Makefile, conf.py, and make.bat.
• Update .gitignore to eliminate references to the removed docs_version2 files.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR refactors the documentation build by introducing a dynamic announcement banner in the Sphinx configuration based on the build_version, streamlines the ReadTheDocs pipeline by removing the old post_checkout copy logic and pointing directly to a single conf.py, and deletes the obsolete docs_version2 directory and related artifacts.

Class diagram for dynamic announcement banner logic in conf.py

classDiagram
    class conf_py {
        +exclude_patterns
        +html_theme_options
        +announcement
        +build_version
    }
    conf_py : if build_version == 'v2' announcement = "...BrainPy 2.0..."
    conf_py : else announcement = "...BrainPy 3.0..."

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File-Level Changes

Change	Details	Files
Introduce conditional announcement in Sphinx conf to switch between v2 and v3 API links.	Replaced static HTML announcement block with an if/else on build_version Updated URLs and link text for both old and new API versions	docs/conf.py
Simplify ReadTheDocs configuration by removing custom copy jobs and using a single conf.py path.	Deleted post_checkout job script that copied docs based on DOC_BUILD_VERSION Updated sphinx.configuration to reference docs/conf.py directly	.readthedocs.yml
Remove obsolete docs_version2 directory and its scaffolding files.	Deleted docs_version2 Makefile, conf.py, and make.bat Removed docs_version2 entries from .gitignore	docs_version2/Makefile docs_version2/conf.py docs_version2/make.bat .gitignore

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[sourcery-ai]

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