feat(featured_trainer): choose how many trainers to feature

[kennethrioja]

Summary of changes

• We can now choose how many trainers we want to feature in the home page

Motivation and context

The value 1 was hardcoded, I wanted more

Screenshots

N/A

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree to license it to the TeSS codebase under the BSD license.

[Copilot]

Pull request overview

Adds configurability for the “Featured trainer” section on the home page by interpreting the site.home_page.featured_trainer setting as a trainer count rather than a boolean toggle.

Changes:

• Update StaticController#set_featured_trainer to sample a configurable number of trainers.
• Update home page controller test expectations to reflect multiple featured trainers and add a “disabled” case.
• Update example config to document the new meaning of featured_trainer (count; blank disables).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
app/controllers/static_controller.rb	Uses the configured featured_trainer value as the sample size when selecting featured trainers.
test/controllers/static_controller_test.rb	Adjusts assertions for multiple featured trainers and adds a “not shown when nil” case.
config/tess.example.yml	Documents featured_trainer as a numeric count with blank meaning disabled.

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