Screenshots and media for tutorials

[dnndev]

Review all tutorials for needed screenshots, videos, or animations. Update existing images and add new ones where they help understanding. Follow naming convention: tutorial-{name}-{description}.{ext}

[dnndev]

Tutorial screenshots status after v5 update (commit c0696a1):

Existing runtime screenshots (kept as-is):

• Tutorial 1: Walkthrough1_AllUsersListView.png
• Tutorial 2: Walkthrough2_AllUsersListView.png, Walkthrough2_DetailView.png
• Tutorial 3: Walkthrough3_FormView.png, Walkthrough3_FormView_Error.png
• Tutorial 5: Walkthrough5_* (4 images)
• Tutorial 6: Walkthrough6_* (8 images)

These runtime screenshots show XMP output, not admin UI, so they still look correct.

New screenshots needed:

• tutorial1-create-view — The + menu in CP toolbar showing New View option

Old v4 UI screenshots removed (no longer referenced):

• ActionMenu_ManageTemplates.png
• ActionMenu_ManageForms.png