PR: Improve tour on mobile by moving popover and thickening outline

[CAM-Gerlach]

Pull Request

Pull Request Checklist

• [x] Read and followed this repo's Contributing Guidelines
• [x] Based your PR on the latest version of the correct branch (master or 4.x)
• [x] Checked your writing carefully for correct English spelling, grammar, etc
• [x] Described your changes and the motivation for them below
• [x] Noted what issue(s) this pull request resolves, creating one if needed

Description of Changes

Simple fixes for the biggest issues making the tour display poorly on small screens; namely, moves the first popover to display below the Spyder window instead of next to it, and doubles the width of the outline of the active element to make it more visible on small screens.

Screnshots

Before and after screenshots on simulated iPhone 6-11:

Note: The logo change is merely due to building in the 4.x branch, and can be ignored.

Issue(s) Resolved

Fixes #187

[CAM-Gerlach]

Thanks for the review @juanis2112