use % notation instead of .format in toast js & livereload js

[comhar]

---

name: toast js + livereload js cleanup
about: use % notation instead of .format in toast js & livereload js
title: '[PR] '
labels: 'cleanup'
assignees: ''

---

Related Issue
This is a followup to PR 587

Proposed Changes
Use % notation instead of .format in toast js + livereload js

Types of changes
What types of changes does your code introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Cleanup

Checklist
Go over all the following points, and put an x in all the boxes that apply:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I am aware that this is an nbdev project, and I have edited, cleaned, and synced the source notebooks instead of editing .py or .md files directly.

[jph00]

Thanks!