Issues with metadata on markdown export

Noticing a few issues with the new `md` command. # Missing Year in markdown file name The file name includes a post date, but it's only the month and year, which interleaves multiple years together # Unfriendly date encoding in file name The file name is including a date encoded in readable text instead of ISO format `Sat\ Mar\ 07-karpathy-i-packaged-up-the-autoresearch-project-into-a-ne.md` # Incorrect metadata The above tweet is metadata that cannot be possible. Specifically the `bookmarked_at` date is before the `posted_at` date - ```yaml --- author: "@karpathy" author_name: "Andrej Karpathy" posted_at: Sat Mar 07 bookmarked_at: 2024-11-20 category: tool domain: ai categories: [tool, research] domains: [ai] source_url: https://x.com/karpathy/status/2030371219518931079 tweet_id: "2030371219518931079" likes: 28298 reposts: 3646 --- ``` This looks like a deeper issuer before the `ft show --json` command also has incorrect data - ```json { "id": "2030371219518931079", "tweetId": "2030371219518931079", "url": "https://x.com/karpathy/status/2030371219518931079", "text": "I packaged up the \"autoresearch\" project into a new self-contained minimal repo if people would like to play over the weekend. It's basically nanochat LLM training core stripped down to a single-GPU, one file version of ~630 lines of code, then:\n\n- the human iterates on the https://t.co/3tyOq2P9c6", "authorHandle": "karpathy", "authorName": "Andrej Karpathy", "authorProfileImageUrl"...