Added ratings images.
Added no assessment error message.
Merge branch 'release-6.6.3.a1' of https://github.com/Gooru/Gooru-Web into release-6.6.3.a1
Merge pull request #2216 from anilgooru/release-6.6.3.a1

DO-5782 - 1.0.b www [Library - Text] Extra space in featured contributor text in Community Library courses : Fixed by Removing extra spaces at the end.
Merge pull request #2211 from mitraj/release-6.6.3.a1

Added ratings images.
Assessment Question type buttons has been added.
Merge pull request #2218 from shivalinga/release-6.6.3.a1

Assessment Question type buttons has been added.