Convert Cypress test into Playwright tests

[6notes]

Summary

This PR addresses #306 by:

• converting the Cypress tests into Playwright tests
• updating the documentation, package.json Cypress scripts, and end to end testing workflow

Further details can be found in the 'Stacked PRs in this series' list below. This PR is a combination of the PRs listed below based on the main branch.

Stacked PRs in this series

• Convert to Playwright 1: Install Playwright and convert forward/back test #312
• Convert to Playwright 2: Convert demo test 6notes/windrift#1
• Convert to Playwright 3: Convert index test 6notes/windrift#2
• Convert to Playwright 4: Convert refresh test 6notes/windrift#3
• Convert to Playwright 5: Convert unit tests page e2e test 6notes/windrift#4
• Convert to Playwright 6: Convert Stone Harbor English test 6notes/windrift#5
• Convert to Playwright 7: Convert Stone Harbor Portuguese test 6notes/windrift#6
• Convert to Playwright 8: Update package.json, GitHub workflow and timeouts 6notes/windrift#7
• Convert to Playwright 9: Remove Cypress files 6notes/windrift#8
• Convert to Playwright 10: Update docs with Playwright links and docs 6notes/windrift#9

[lizadaly]

Automated tests and deployment passed, so merging this! Thank you so much!