Documentation for older version links to recent version

[froque]

For example:

• Documentation for Quartz in https://jooby.io/v2/#modules links to https://jooby.io/modules/quartz and should link to https://jooby.io/v2/modules/quartz/
• Documentation for Quartz in https://jooby.io/v3/#modules links to https://jooby.io/modules/quartz and should link to https://jooby.io/v3/modules/quartz/
• https://jooby.io/#modules links correctly to https://jooby.io/modules/quartz

There are many more than this.