Pull settings from frontmatter

Try and silently fail to pull all settings from documents frontmatter using same exact setting keys.

```md
---
headerTemplate: "<div style=\"font-size: 9px; margin-left: 1cm;\"> <span class='title'></span></div> <div style=\"font-size: 9px; margin-left: auto; margin-right: 1cm; \"> <span class='date'></span></div>"
format: "A4"
---

...

```