docs: added doc pages for v1.20.4

[shahednasser]

• Added new documentation page for Medusa Worker.
• Updated Railway deployment guide with details on Medusa Worker.
• Small adjustments to the worker_mode option's TSDocs.

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[olivermrbl]

Minor change to how we refer to the worker: Medusa Worker -> Worker Mode for a Medusa instance

[shahednasser]

@olivermrbl implemented the change

[olivermrbl]

Nice!