Update hardcoded vaadin version to 24.7.3 (#4276)

* Update hardcoded vaadin version to 24.7.3

* Update _vaadin-version.adoc

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Co-authored-by: Zhe Sun <[email protected]>

docs: cross-reference long-running-tasks.adoc from progress-bar (#4235)

chore: bump latest to 24.8.0.alpha4 (#4249)

* bump version

* update Lit examples

* update React examples

Skeleton structure updates (#4237)

* Update skeleton walkthrough to explain new project structure

* Update Add View (Flow) to use new skeleton structure

* Update Navigate to a View (Flow) to use new skeleton structure

* Update Add Login (Flow) to use new skeleton structure

* Update Protect Views (Flow) to use new skeleton structure

* Update Protect Services (Flow) to use new skeleton structure

* Update Hilla guides to use new skeleton structure

* Use main view instead of root view for consistency

* Minor tweaks

Update vaadin version to 14.12.7 (#4230)

docs: custom item data for context menu and menu bar (#4158)

Co-authored-by: Russell J.T. Dyer <[email protected]>

hilla: document request options (#4142)

* Document request options

* Edited new text only.

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Co-authored-by: Russell J.T. Dyer <[email protected]>

fix: update popover dropdown field to open on arrow down (#4151)

Update vaadin version to 14.12.6 (#4138)

Co-authored-by: Zhe Sun <[email protected]>

Add guide for automatic DNS and certificate management in Control Cen…

…ter (#4117)

* docs: add guide for automatic DNS and certificate management in Control Center

* Address review comments