HTML templating
It would be nice to have a form of HTML templating. This might belong to Jester or an external library.

With "templating" I mean something like https://nim-lang.org/docs/filters.html#available-filters-stdtmpl-filter rather than https://flyx.github.io/emerald/  with some features:

- HTML "lookalike". Code lines could be prefixed by "#" as in stdtmpl or wrapped in "<% ... %>"
- no stdtmpl "header", in order to allow editors to treat the template as HTML
- ability for a template to include or being included by other templates
- discovery and load of template at compile or runtime (e.g. from ./views/*.tmpl )
- being similar to popular HTML templating languages could help transitioning existing code to Nim

