chore: CSS Gallery

[Parul1606]

Related Issue

Closes: #282

Description of Changes

I have added a new section to the resources gallery "CSS" and in that, I have added the books section, resources section, and gaming adventures section.

Checklist:

• [x] My code adheres to the established style guidelines of this project.
• [x] I have conducted a self-review of my code.
• [x] I have included comments in areas that may be difficult to understand.
• [x] I have made corresponding updates to the project documentation.
• [x] My changes have not introduced any new warnings.

Screenshots

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[Parul1606]

Please review it as soon as possible @Alkaison

[Parul1606]

Please review this PR @Alkaison

[Alkaison]

Hi @Parul1606 please resolve the merge conflicts.

[Parul1606]

Hi @Parul1606 please resolve the merge conflicts.

Done