[TRI-1428] : Improve the SendGrid integration documentation

[Rutam21]

Closes #662

✅ Checklist

• I have followed every step in the contributing guide
• The PR title follows the convention.
• I ran and tested the docs site and it works properly.

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Testing

I locally deployed the Docs Website using Netlify and verified all the changes.

Video Snapshot

SendGrid.mp4

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Changelog

The SendGrid Documentation has been updated such that it follows the same format as the GitHub Integration.

SendGrid Documentation is now divided into two sections.

• SendGrid Overview and Authentication
• SendGrid tasks

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Screenshots

Overview and Authentication Page

Tasks Page

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Latest commit: 4768dc4

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[Rutam21]

This PR exactly follows the GitHub Integration format.

• An overview section has been added based on the official SendGrid Site.
• Both the Overview and Tasks pages have been separated properly.
• Comments have been added to all the code blocks for better understanding.

Please review and suggest changes, if any. Thanks.

cc: @D-K-P

[D-K-P]

@Rutam21 this is close:

Overview

• Add a link to the sendgrid docs for how to create an api key

Tasks

• Remove payloads and put examples. "< your-email-address >" etc

Thanks!

[Rutam21]

@D-K-P I have included all the suggested changes. Please review. Thanks.

[Rutam21]

@D-K-P I believe this PR is now ready for merge. Thanks.

[D-K-P]

Resolve the conflicts and I'll merge @Rutam21 - thank you!

[Rutam21]

@D-K-P Merge conflicts are resolved.