Updated the docs for hed-python

[VisLab]

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[Copilot]

Pull request overview

This PR updates documentation and terminology across the HED Python tools repository. The main focus is on standardizing terminology (e.g., "HEDTools" vs "hedtools"), improving documentation clarity, updating links, and making a minor API change to make an internal method private.

Key changes:

• Renamed extract_definitions() to _extract_definitions() in Sidecar class to indicate it's an internal method, with corresponding test updates
• Standardized capitalization of "HEDTools" and related terms throughout documentation
• Updated and improved documentation for user guide, introduction, README, and API references
• Enhanced command-line tool documentation with more detailed format descriptions

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
tests/models/test_sidecar.py	Updated test to call _extract_definitions() instead of extract_definitions()
tests/models/test_base_input.py	Updated test to call _extract_definitions() instead of extract_definitions()
hed/scripts/validate_bids.py	Standardized "HEDTools" capitalization and expanded format help text
hed/models/sidecar.py	Renamed extract_definitions() to _extract_definitions() to make it private
examples/extract_json_template.ipynb	Added metadata, reformatted cells, updated terminology
examples/README.md	Reformatted tables, standardized headings, updated links
docs/user_guide.md	Extensive updates: fixed terminology, improved explanations, added sections, updated code examples
docs/introduction.md	Standardized terminology, updated links, improved quick start examples
docs/index.rst	Added explicit titles to TOC entries
docs/api/validator.rst	Standardized heading capitalization
docs/api/tools.rst	Standardized heading capitalization
docs/api/schema.rst	Standardized heading capitalization
docs/api/models.rst	Standardized heading capitalization
docs/api/index.rst	Standardized heading capitalization and title
docs/api/errors.rst	Standardized heading capitalization
docs/_templates/quicklinks.html	Added table-remodeler link
docs/_static/custom.css	Added dark mode support for auto mode with system preference
README.md	Standardized terminology, updated links, improved formatting

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