Update Index.cshtml

Many changes here. Removed redundant info. Please check my links - some use a format like <a href="/Docs/Installing">Step-by-step install guide for installing Glimpse</a> and some use 
<a href="/Installing">Step-by-step install guide for installing Glimpse</a>  - Do I need the /Doc?
changed Once you’ve enabled Glimpse on the server and the client to Once you've enabled glimpse. Is that OK. Where do you enable on the client?

If I have the link format incorrect, reject this change and tell me how to format them correctly, I'll make the update.