feat(studio): adds guided tour button to top

[ptrckbp]

Running a little experiment to see if people want to use the tutorial / help buttons in app. On pages with no help icon (like the flow editor), a tutorial button appears (see images), where the help button would normally be and triggers the Guided Tour.

This also standardizes the buttons to have the same spacing, and icon + title.

On a page with no existing help button : Before

After

On a page with an existing help button : Before

After

This also adds analytics to the tutorial steps and simplifies the tracking implementation by removing error handling.

[ptrckbp]

Also adds this step to the guided tour so people know to click to re-read :

[laurentlp]

@ptrckbp Any update?