Show blogs on homepage.

- PageController.php >> Added code to fetch the DoctrineManager, query the database, write it to an array, and render the index template with the array.
- index.html.twig >> Added structure to view blogs ( for..else..endfor, path('BloggerBlogBundle_blog_show', { 'id': blog.id }))

Signed-off-by: Parth Sarin <parthsarin@gmail.com>