Add Support for Position, Avatar, and Opacity Props in VLibras Widget

[lucasferreiralimax]

This pull request introduces support for the position, avatar, and opacity props in the VLibras Vue.js component. This enhancement allows developers to customize the widget's appearance and positioning on their websites.

Changes Made:

• Added position Prop:
  • Enables setting the widget's position (e.g., left, right, top, bottom, etc.).
• Added avatar Prop:
  • Allows selection of the widget's avatar from predefined options (e.g., icaro, hosana, guga, random).
• Added opacity Prop:
  • Provides the ability to adjust the widget's opacity for better visibility and integration with different website designs.

Usage Example Update:

• Updated the documentation to include usage examples for the new props, including code snippets for integrating the features.

[github-actions]

Visit the preview URL for this PR (updated for commit 16bb365):

https://vue-vlibras--pr10-support-new-props-j190onp8.web.app

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