[Vondry]

Summary

This PR has two commits:

1. feat(admin): moves the Meta Robots Tag field above the Canonical Link field in the SEO field's edit form.
2. docs(readme): replaces screenshots/screenshot.png, the image in the README's "Setup" section, with an up-to-date Bolt 6 screenshot that shows the new order.

It replaces #75, which only updated the screenshot.

1. Field order

The robots setting is changed far more often than the canonical link or the Open Graph type, so it now comes right after the snippet preview:

Before	After
SEO Title	SEO Title
Meta description	Meta description
(Meta keywords, hidden by default)	(Meta keywords, hidden by default)
Google snippet preview	Google snippet preview
Canonical Link	Meta Robots Tag
Meta Robots Tag	Canonical Link
Open Graph Type	Open Graph Type

Only the order of the fields in the form changes. In templates/seo.html.twig, two {{ block() }} lines swap places. The field ids, the input names, the stored JSON and the front-end output stay the same. seo.js finds the fields by id, so it does not depend on their order.

A new test, SeoFieldTemplateTest::testFieldsAreRenderedInTheAdminOrder, renders the whole field and checks the order. It fails on main.

2. Screenshot

The old screenshot came from the Bolt 5 admin:

• the group label was French ("Référencement");
• both fields showed a 70-character limit, but the defaults are now 60 for the title and 158 for the description;
• it still showed the Shortlink (alias) field, which refactor(field): remove the Shortlink field #72 removed;
• some help texts have changed since then.

The new screenshot:

• shows the SEO field's tab in the Bolt 6.1.10 admin, in English, with the extension's default config and the new field order. The keywords field is hidden, because keywords_length is 0 by default;
• was taken on a fresh Bolt 6 install running this branch, with the seo field added to pages as the README describes. English example values were typed into the form, so the snippet preview shows the live title, the postfix and the description. Nothing was saved;
• is taken at 2x for high-DPI screens (1490 × 1722, 218 KB).

Tests

• vendor/bin/phpunit: OK (144 tests).
• npm test: 22 pass, 1 fail. The failing test, "typing in the SEO shortlink input persists it", also fails on main. test: drop the removed shortlink field from the seo.js tests #74 fixes it.