On Planet: Link to Blog itself

[guptadiksha307]

Issue Description

Fixes #1529

Changes Made

On the right of the planet page (Home -> Community -> OCaml Planet) there is a list of blogs. Clicking on one of them opens the rss rather than the blog itself. I have added a link to the blog itself so that if one of the blogs is clicked, then the main page of the blog opens up.

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[guptadiksha307]

Talking about the code structure, firstly I built a function get_blog_feeds that gave me list of tuples like [("name1","url1"); ("name2","url2");(..)] then I sorted this list according to name and then I changed this list as [("href","url1"); ("href","url2");(..)] then I iterated over this list to get first element [("href","url1")] and added this list as an attribute to a element