As a DevOps Engineer - I want to revise the way blog graphics are uploaded to the static-assets s3 bucket

Currently a client is used to manually upload blog graphics to an s3 bucket which is served using a cdn in the form of aws cloudfront. This manual steps seems unnecessary, maybe we can host the static-assets in this repository aswell and have an github actions that uses terraform to upload the .png files and their directories to s3 automatically.

- [ ] Enforce a naming convention on the directories - e.g., everything lowercase.
- [ ] Possibly have subdirectories where content for each year is segregated.