Add first sad 404 image

[PalAditya]

Adding a single sad image for 404 path. This fixes #20

Question: Should we add a few such images, and choose one among them randomly? How it looks on my system:

Tried a few responsive views and that's good as well.

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Name	Status	Preview	Comments	Updated (UTC)
waifus-for-programmers	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 9, 2023 3:08pm

[asrvd]

@PalAditya yea you may randomize them but please remove the backgrounds and don't host the image directly on the site (it will consume unnecessary bandwidth), just upload the image to a github readme and copy the asset url from there and use it instead