Improved UI of Videos , Images and GIFS in DOCS

[sanketshinde3001]

Issue soled - #125
It will maintain continuity in UI.
Changes made in both Version of DOCS.

Before :

After:

[CLAassistant]

All committers have signed the CLA.

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[yuyutaotao]

Can we make this a plugin or something of Rspress ? That would be easy to maintain.

[sanketshinde3001]

@yuyutaotao Sir, could you please provide more details about it? I'm willing to help.

[yuyutaotao]

Hi，it should be a plugin like this: https://github.com/linbudu599/rspress-plugins/tree/main/packages/rspress-plugin-align-image

[sanketshinde3001]

@yuyutaotao I'll start work on it.

[zhoushaw]

Thank you for your contribution. Since this pull request has been inactive for over a month, it will be closed. If further merging is needed, please feel free to submit a new request. @sanketshinde3001