It would seem that the old tesh test is not taking into account note
titles with `"` marks. Therefore, the failing test may be a sign of the
test needing to be updated, rather than this fix being void.
Fallback wiki link resolution by matching on title or path
Add new template variables when generating Markdown links
Add a {{substring}} template helper
* Move everything under the internal package.
* Better separation between core and adapter packages, for easier unit testing.
* Simplify data models.
* Support multiple opened notebooks during runtime (useful for the LSP server).
* Proper surface API which might be exposed later as a public Go package.
