Revamp firefox extension

[tanmoysrt]

Referenced to the issue #30

Tasks

• [x] UI Design Design Here
• [x] Convert to manifest v3. As support of manifest v2 going to removed in 2023
• [x] OAuth 2.0 Implicit Token Based Authorization
• [x] Implementation of API for Insert Image and add hyperlink to it
• [x] UI Implement
• [x] Integrate UI

Improvements :

• Upgrade to Manifest V3 (as chrome store will stop support for V2 from 2023)
• Removed dependency on google slides add-on by implementing UI interface and logics in client side
• New UI for Extension
• Make the extension more user friendly

Proposed Design :	Login Screen	Embed Tool Screen

Final Preview :

Note : Client ID of oauth need to be updated in embedTool.js before merging

[tanmoysrt]

Wrong updates ! Closing