Issue misc fixes - color themes

[kunwarsaluja]

Fix #176

Test URLs:

• Before: https://main--zemax--hlxsites.hlx.page/pages/ansys-ob-downloads
• After: https://issue-misc-fixes--zemax--hlxsites.hlx.page/pages/ansys-ob-downloads
• After: https://issue-misc-fixes--zemax--hlxsites.hlx.page/pages/ansys-os-downloads
• After: https://issue-misc-fixes--zemax--hlxsites.hlx.page/pages/opticsviewer-downloads-legacy

[aem-code-sync[bot]]

Hello, I'm Franklin Bot and I will run some test suites that validate the page speed. In case there are problems, just click the checkbox below to rerun the respective action.

• [ ] Re-run PSI Checks

[aem-code-sync[bot]]

Page	Scores	Audits	Google
/pages/ansys-ob-downloads		Lighthouse returned error: Something went wrong.
/pages/ansys-os-downloads
/pages/opticsviewer-downloads-legacy

[aem-code-sync[bot]]

Page	Scores	Audits	Google
/pages/ansys-ob-downloads
/pages/ansys-os-downloads
/pages/opticsviewer-downloads-legacy