Refactor share-page macro for compatibility Jinja2 templates

[SriHV]

What is the context of this PR?

3170... Removed .push method which was used for adding facebook and twitter icons to a list. This is done to make share-page work in Jinja templates.

How to review this PR

• Test the changes in Design system
• Pull the latest PR (link) which is in review. Follow the updated readme.
• Update the macro and test it in Flask.

Checklist

This needs to be completed by the person raising the PR.

• [x] I have selected the correct Assignee
• [x] I have linked the correct Issue

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