Add icons for community registry devfile stacks

[johnmcollier]

Currently, none of the devfile stacks in the community devfile registry have icons (minus springboot which is using the incorrect icon), and we default to the default "devfile.io" icon:

We should get proper icons added to all of the devfile stacks so that they show in the registry viewer, rather than the default icon we currently show.

[johnmcollier]

Potential Icons:

• Django: https://static.djangoproject.com/img/logos/django-logo-positive.svg
• NodeJS: https://nodejs.org/static/images/logos/nodejs-new-pantone-black.svg
• Open Liberty: https://raw.githubusercontent.com/OpenLiberty/logos/master/logomark/svg/OL_logomark.svg
• Python: https://www.python.org/static/community_logos/python-logo-generic.svg
• Quarkus: https://design.jboss.org/quarkus/logo/final/SVG/quarkus_icon_rgb_default.svg
• Spring: https://spring.io/images/projects/spring-edf462fec682b9d48cf628eaf9e19521.svg
• Vert.x https://github.com/vertx-web-site/vertx-logo/blob/master/vertx-logo.svg
• Wildfly & Wildfly Bootable Jar: https://design.jboss.org/wildfly/logo/final/wildfly_logomark.svg (or https://design.jboss.org/wildfly/logo/final/wildfly_logo.svg)

[johnmcollier]

PRs:

• Springboot, Python, Python-Django: Add icons for springboot, python, python-django registry#54
• OpenLiberty: Add icon for Open Liberty registry#55
• Vert.X: Add icon for java-vertx stack registry#56
• NodeJS: Add icon for nodejs stack registry#59
• Wildfly: Add icons for wildfly stacks registry#58
• Quarkus: Add icon for java-quarkus stack registry#57