SunbirdEd-portal repo description pointing to dead link of installation

[baljeetsingh]

https://github.com/Sunbird-Ed/SunbirdEd-portal/tree/release-5.1.0
Repo About description is pointing to wrong url of installation docs
Currently it reads as

About
Web Portal for sunbird software. Provides the web interfaces for all functionality of Sunbird. 

Find the installation instructions at: 
http://www.sunbird.org/developer-docs/installation/

correct url is
https://ed.sunbird.org/use/installing-ed-platform

I feel that over all message could be changed to this (include bb home), so that user / dev can get more details about it

Web Portal for sunbird software. Provides the web interfaces for all functionality of Sunbird. 

Know more about sunbird-ed
https://ed.sunbird.org/learn/readme

Find the installation instructions at: 
https://ed.sunbird.org/use/installing-ed-platform

[Krishnaj20]

@rajeevsathish @chitranshu-keshav @vinukumar-vs - Please look into this query and respond.

[vinukumar-vs]

@baljeetsingh Thanks for highlighting the issue. We will update it ASAP.

@rajeevsathish Can you look into it & update the description to point to microsite installation document.