Add meta description

[Divjot Singh]

• Initially we can simply add some desc of the project and nishaan
• As we progress, we can collect meta data from current route;
  • Rahao pangti of current Shabad (Depends on #83)
  • Shabad results
  • Author Page
  • Raag Page
  • SGGS Ang
  • Nitnem Details

[Divjot Singh]

Thanks to 36a5e9e, we now add titles based on routes.

We can extend it further to add meta data next.