* Updated text to have a code block
previously was displaying the image as if reading the code. added code block to display as code. Added "This is how it will look in an html doc" to maintain consistency
* Update index.md
* Updated index.md
I have provided more info about what the solution that cards grant you and what key features can be created using cards
* Grammar fixes
changed sentence "you need to create a ```<div>``` container with the class ```.card``` and inside another ```<div>``` container" to "you need to create a ```<div>``` container with the class ```.card``` and inside of that another ```<div>``` container"
* Fixed markdown and examples
* Fixed markdown in starting section and 'Header and Footer' section
* Fixed example code structure in starting section and 'Header and Footer' section
* Add correct syntax
