Add DB migration: pages table
Add page model
Modify routing

fint page and parse markdown
Add PageController
Apply haik-markdown

Add extended HaikMarkdown class
Add ParsingServiceProvider and ParserFacade
Use ParserFacade at PageController
Modify composer.json: Add autoload option
Add plugin routing

Each plugin can have routes.php.
Each plugin can have Controller.php.
routes.php load plugin routes.
Add classmap haik-app/plugins to composer.json
Update dependencies