Various improvements to how we handle and display comic logos

[elijahcarrel]

Some of these need to be fixed in code but others are not specific to code

• Retool re-uploading of the same image to the same s3 location seems to be broken
• max-age should not be set to 60*60*24*365*2 = 63072000 = two years, or at least we should have some mechanism to bust the cache in order to re-upload images. Not sure how this is getting set so high but see https://nextjs.org/docs/pages/api-reference/components/image#caching-behavior
• (Should logo images have randomly generated meaningless filepaths rather than meaningful ones? Might fix the above problems.)
• Have a separate staging s3 bucket
• Comic logos should be at minimum 200px x 200px to support higher-resolution displays. We can rely on Vercel image optimization to shrink them for smaller screens
• Make sure to specify width/height so that if we upload a non-square image it doesn't look terrible
• Maybe switch to png so we can support transparency