Changed KContentRenderer to ContentRenderer.

[ShivangRawat30]

Summary

This PR Renames the KContentRenderer to ContentRenderer.

References

#11282

Reviewer guidance

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[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.16.0b5.dev0_git.322.g1c6cffa1.pex
Windows Installer (EXE)	kolibri-0.16.0b5.dev0+git.322.g1c6cffa1-unsigned.exe
Debian Package	kolibri_0.16.0b5.dev0+git.322.g1c6cffa1-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.16.0b5.dev0+git.322.g1c6cffa1-0.3.0.dmg
TAR file	kolibri-0.16.0b5.dev0+git.322.g1c6cffa1.tar.gz
WHL file	kolibri-0.16.0b5.dev0+git.322.g1c6cffa1-py2.py3-none-any.whl

[AllanOXDi]

LGTM!

[rtibbles]

Retargeting to develop to avoid last minute changes in release.

[rtibbles]

This has not updated the name of the KContentRenderer component file:
https://github.com/learningequality/kolibri/blob/release-v0.16.x/kolibri/core/assets/src/views/ContentRenderer/KContentRenderer.js
Ideally this file would be renamed to index.js

Updates are also needed to references to it here: https://github.com/learningequality/kolibri/blob/release-v0.16.x/kolibri/core/assets/src/core-app/index.js#L16

With the above rename, the import can be changed to:

import ContentRenderer from '../views/ContentRenderer';

[ShivangRawat30]

@rtibbles I have made the requested Changes, kindly review them.