About link

[valentinRyckaert]

Summary of changes

• Add a feature in tess.yml to add a link to the TeSS documentation
• Add redirection from each about route to the specific documentation page (helpful for create links to the docs on other pages)

Motivation and context

Linked to this pull request

A lot of information is both in the TeSS docs and on the TeSS about page.
The goal is to merge the about page information with the TeSS documentation, and so directly redirect to it.

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

This PR adds an optional site.about_us_link configuration to redirect TeSS “About” routes to corresponding pages in the TeSS documentation, enabling instances to deprecate/replace local About-page content with external docs.

Changes:

• Added site.about_us_link to TeSS configuration (example + test config).
• Added AboutController before_action to redirect specific About actions to documentation URLs when configured.
• Updated the header navigation rendering to add link options when about_us_link is present.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
test/config/test_tess.yml	Adds site.about_us_link test config key (unset by default).
config/tess.example.yml	Documents new site.about_us_link option and intended formatting.
app/views/layouts/_header.html.erb	Adjusts nav link rendering based on about_us_link.
app/controllers/about_controller.rb	Implements per-action redirects to documentation URLs when configured.

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