feat: create a new page to do LTI 1.3 migration

[PenghaiZhang]

Checklist

• [x] the [contributor license agreement][] is signed
• [x] commit message follows [commit guidelines][]
• [x] screenshots are included showing significant UI changes
• [ ] documentation is changed or added

Description of change

In the settings page, there is new link which points to the LTI 1.3 migration page.

Please note the migration page has only some placeholder UI in this PR.