flag for crawling links, following the routes and prerendering them

[gabrielperales]

would that be a good idea? I'm creating an static blog and I'm using this plugin, I thought it would be a good idea to add that flag to the configuration file.

[gabrielperales]

@ABuffSeagull I already have a first implementation of this feature working. Maybe I should add a max deep level config value or something like that, but anyway if you think this feature is interesting I can make a PR