Add ability to sync multiple collections and fix bugs

[parkerbxyz]

This pull request includes changes in the README.md, action.yml, github_publisher.py, and Pipfile files. The primary changes are related to the ability to sync multiple Guru collections simultaneously, changes in the naming convention of inputs, and modifications to the github_publisher.py script for better error handling and improved code efficiency.

Improvements to file path handling:

• github_publisher.py: Several methods have been updated to use the quote function from urllib.parse when creating URLs for GitHub API requests, which ensures special characters in file paths are correctly encoded. The rstrip method calls on collection and folder names have been replaced with strip to remove leading and trailing whitespace. [1] [2] [3] [4] [5] [6]

Updates to handling multiple Guru collections:

• README.md: The documentation has been updated to reflect changes in how multiple Guru collections are handled. Instead of using a matrix strategy, a comma-separated list of Collection IDs is now provided to the guru-collection-ids input. [1] [2]
• github_publisher.py: The script now supports multiple Guru collections by accepting a comma-separated list of Collection IDs from the GURU_COLLECTION_IDS environment variable.

Deprecation of input parameters:

• action.yml: The guru_collection_id and collection_directory_path input parameters have been deprecated and replaced with guru-collection-ids and collection-directory-path, respectively. The runs section has been updated to support both the new and deprecated parameters. [1] [2]

Other changes:

• Pipfile: The reference for the guru package has been updated.
• README.md: The note has been changed to a tip.
• github_publisher.py: Several other minor changes have been made, including better error handling when a SHA is not found in the repository, and better handling of images without an extension or filename in convert_card_content. [1] [2] [3]

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ COPYPASTE	jscpd	yes		no	1.87s
✅ MARKDOWN	markdownlint	1		0	0.33s
✅ MARKDOWN	markdown-link-check	1		0	0.91s
✅ MARKDOWN	markdown-table-formatter	1		0	0.3s
✅ PYTHON	bandit	1		0	1.22s
✅ PYTHON	black	1		0	1.09s
✅ PYTHON	mypy	1		0	8.04s
✅ PYTHON	ruff	1		0	0.06s
✅ REPOSITORY	checkov	yes		no	11.53s
✅ REPOSITORY	gitleaks	yes		no	0.29s
✅ REPOSITORY	git_diff	yes		no	0.0s
✅ REPOSITORY	grype	yes		no	11.59s
✅ REPOSITORY	secretlint	yes		no	0.99s
✅ REPOSITORY	trivy	yes		no	4.04s
✅ REPOSITORY	trivy-sbom	yes		no	2.45s
✅ REPOSITORY	trufflehog	yes		no	8.02s
✅ SPELL	cspell	5		0	3.67s
✅ SPELL	lychee	2		0	0.24s
✅ YAML	prettier	1		0	0.65s
✅ YAML	v8r	1		0	2.48s
✅ YAML	yamllint	1		0	0.24s

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