docs(navigation): document Form Configuration

[blakeaowens]

Description

Form Configuration had a single bullet on the Sidebar Menu page, and that bullet was added in passing by an unrelated documentation change, so there was nowhere explaining how to use the feature.

Adds a Configuring Forms page under Navigation, beside Customizing Tables, covering:

• Where the setting lives, and that it applies to everyone rather than being a personal preference. Changes are picked up on the next page navigation.
• Choosing which form to configure.
• The three states a field can be in: not configurable, always required, or configurable.
• The controls on a configurable field: Placement between the main body and the Optional Fields section, Required, and Disabled.
• Reordering fields by dragging, including that reordering controls sequence only and does not move a field between the main body and Optional Fields, and that an otherwise non-configurable field can still be reordered.
• The Expand Optional Fields by Default setting.
• What Save and Reset to Defaults do, and that each form is stored separately so resetting one does not affect the others.

Also links the Form Configuration bullet on the Sidebar Menu page through to the new page.

Note for whoever merges

This changes the Form Configuration bullet on the Sidebar Menu page. The page layouts documentation PR changes the Layout Defaults bullet directly beneath it. They are independent and either can go first, but the second one merged will want a one line rebase on that file.

Test Commands

• /test all - run all tests

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Test Configuration

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