Meta Tags, OpenGraph and Twitter Cards

[shaedrich]

Related to ponylang/pony-tutorial#546

This could be implemented statically into static/web.html at first, but it would make sense to prospectively make it dynamic by converting it to a template and creating the tags depending on the Query params.

• snippet file name?
• preview image of snippet, code, or gist
• extract docstrings from snippets and gists as description (could technically even be interpreted as frontmatter to support more than just the description)

I know, I'm crazy, but one should be allowed to dream every once in a while 😉

[shaedrich]

I went ahead and made an example implementation of how the static variant would look: #227

[shaedrich]

I also added a PR for the dynamic implementation, that would be necessary for snippet filenames as titles as well as a description: #228

I haven't tested this one yet, but this would be the directed for the implementation