Fix the description of the $urltransform modifier and update the tracker bypass example

[ngorskikh]

Subj.

[Copilot]

Pull request overview

Updates the documentation for the $urltransform modifier to reflect its transformation pipeline behavior and refreshes the affiliate/tracker bypass examples accordingly.

Changes:

• Clarifies that $urltransform applies a series of transformations rather than a single regex replacement.
• уточняет (documents) execution order when multiple $urltransform rules match: applied sequentially in lexicographical order.
• Replaces the tracker-bypass example with modern pct/b64 transformation-based rules and adds a note about “Changing the origin”.

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[github-actions]

Preview was deployed to: https://pull-request-887.kb-adg.pages.dev/

[Alex-302]

@el-termikael ping

[github-actions]

Preview was deployed to: https://pull-request-887.kb-adg.pages.dev/

[el-termikael]

Suggested change

	Note that in both rules, the `$urltransform` value starts with `/^http`, so the full request URL is transformed. Without this prefix, only the path and query parts of the URL can be transformed.
	Note that in both rules, the `$urltransform` value starts with `/^http`, so the full request URL is transformed. Without this prefix, only the path and query parts of the URL can be transformed.