Portal navigation and Runner Templates

A regrouped portal sidebar and the Runner Templates page are now available.

• The portal sidebar groups services by area. Planned services show a Soon label and don't open a page. Workspace settings are tabs under Settings, and your own profile, appearance, language and timezone are in the account menu.
• Runner Templates is available under CI & Runners. It lists ten GitHub Actions workflows for Runzivo runners, with filters, a YAML preview and a copy button, in English and French.
• The Terraform template applies only on pushes to main through a GitHub environment. Add required reviewers to that environment before you use apply.