Improve Workers docs for Octopus Cloud

[samjetski]

[sc-62106]

Aside from the Dynamic Workers page, the current Workers section is exclusively oriented towards self-hosted Octopus.

We have some opportunities here:

• Sell the Octopus Cloud offering, to support our Cloud Revenue OKR
  • The DW page doesn't currently link to Octopus Cloud anywhere
  • No other part of Workers mentions DW or cloud, despite it being a significant part of our offering
• Fix the broader Workers and Worker Pools docs to include Dynamic Workers as an option
  • For a potential customer, it just looks way more complex than it needs to be
  • For a cloud customer getting started, it leads them away from the easy route. The "Built-In Worker" explanation is misleading, deploying your own tentacle worker is usually unnecessary, and they would have to stumble on Dynamic Workers by accident.
• Clarify what the default pool does (there must always be one, but what is it?), and how it differs across self-hosted and cloud.
• Improve our guidance about selecting worker image versions. We should recommend using worker-tools images as first preference over selecting a worker OS version.

Changes required before merging:

• Merge Change Dynamic Worker defaults to Linux #2024
• Reflect current default DW pool. Either:
  • Include cutover date in doc, i.e. "Cloud customers who signed up before... will have Windows as the default pool on new spaces, and on existing spaces unless they have changed it", or
  • Revert default pool info to Windows, and update later when publishing cut-over date
• Update modified date on all pages

This was raised as part of Make Linux the default Dynamic Worker.

[shortcut-integration]

This pull request has been linked to Shortcut Story #59991: Update public documentation around Dynamic Worker Pools.

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[shortcut-integration]

This pull request has been linked to Shortcut Story #62106: Improve public documentation around Dynamic Workers.

[steve-fenton-octopus]

Hi @samjetski

I've pushed a little fix for spelling related things, which involved a merge from main (to get the latest dictionary).

[steve-fenton-octopus]

LGTM