Add HydePHP 2 migration plan and wire it into docs navigation#61

DannyvdSluijs with Copilot wants to merge 3 commits into

mainJsonMapper/jsonmapper.github.io:mainfrom

copilot/migrate-from-jekyll-to-hydephpJsonMapper/jsonmapper.github.io:copilot/migrate-from-jekyll-to-hydephpCopy head branch name to clipboard