feat(email-templates): a library form mjml email templates

[bsahitya]

Description

Includes a typescript library for email templates and a frontend app for email generation.

What's included?

The email-templates library exports:

• An interface EmailTemplate
• Methods:
  • getCssStyles: Function to get common CSS styles as a string
  • getEmailTemplates: Function to get a list of all the email templates
  • getMjmlStyles: Function to get common MJML styles as a string
  • getHtmlTemplate: Function to convert MJML to HTML

The email-generator app exposes an angular app which can be used to create email templates.

Test Steps

• nx run email-templates:build
• then check the dist folder for the final build
• use the build files in any node/ts project.
• Run nx run email-generator:serve
• View the email generator app
• Change templates from the side nav

General Tests for Every PR

• npm run start still works.
• npm run lint passes.
• npm run stylelint passes.
• npm test passes and code coverage is not lower.
• npm run build still works.

Screenshots or link to StackBlitz/Plunker

Email generator app

[owilliams320]

This looks great! 🔥 🔥 🚀 Thank you @bsahitya for this contribution 🤗

[owilliams320]

do we still need this "?raw" since we are not using Vite for this app?

[owilliams320]

🎉 This PR is included in version 8.21.0 🎉

The release is available on:

• v8.21.0
• GitHub release

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