ConvertMarkdownToHTML converts post's body into HTML.

MakeGraph returns a graph for a given list of `Posts`.

NewPost returns a new Post.

ReadFiles reads the given directory and appends into given posts.

ReplaceLinks replaces all the `[[]]` links in the body with the link to the HTML page.

LinkRegex is the regex of links in posts.

Link is the link given to another post.

Metadata contains the metadata extracted from the frontmatter of the post.

Post contains all the necessary things to render a post.