Small UI inconsistencies

[fgrgic]

Description

• Makes the destructive color more legible in the dark mode
• Fixes a broken avatar of one testimonial
• Fixes page sometimes horizontally scrollable (because orbit is too wide to fit on the screen)

Contributor Checklist

Make sure to do the following steps if they are applicable to your PR:

• Update e2e tests: If you changed the /template/app, then make sure to do any neccessary updates to /template/e2e-tests also.
• Update demo app: If you changed the /template/app, then make sure to do any neccessary updates to /opensaas-sh/app_diff also. Check /opensaas-sh/README.md for details.
• Update docs: If needed, update the /opensaas-sh/blog/src/content/docs.