metadata changes

[arekouzounian]

This commit is made to address #3

Here are the new changes:

• meta.json now holds these fields:
  • LastChanged, which is a UNIX timestamp regarding the time when the document was last changed
  • Author, which is the author field
  • Title, which is the title of the post
  • Description, which is a short description likely to be shown on the main posts page.
• It no longer holds the CreatedAt field, which can be inferred from the timestamps on the uploaded version
• Metadata is now populated through an interactive command line process on the post init subcommand; this reinforces the desired way of creating posts through post init and then post upload rather than a manual method
• LastChanged timestamps are updated accordingly when a post is being uploaded via post upload

Going forward, these fields are going to be used on the /posts page to show short descriptions under each post, Additionally, they will be used on each individual post to show the author, title, and last changed dates.

[arekouzounian]

Incredible work, honestly. I could not have written better code myself.