Add Sidebar to 404 pages in docs

[corlard3y]

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Issue Description

Add Sidebar to 404 pages in docs

[ANAMASGARD]

Hi @corlard3y,

I'd like to work on this issue and add the sidebar to 404 pages in docs.
Could you please assign this to me? Here's my approach:

1. Find the 404 page template in the codebase
2. Identify the sidebar component used on doc pages
3. Add the sidebar component to the 404 template
4. Test to ensure it displays properly

Looking forward to contributing!