fix: correct phpstan errors and update schema urls

This commit includes several modifications:

• Removed the ignoreErrors directives in phpstan-baseline.neon as the corresponding issues have been resolved
• Updated 'itemtype' URL from 'http://' to 'https://'
• Removed an obsolete comment block above the getSite method in Timeline.php
• Added variable documentation in types/timeline.php to clarify variable types and avoid phpstan errors.

Related: #3 (closed)

mentioned in commit ce120e67

merged

This MR is included in version 2.0.3

The release is available on GitLab release.

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