QREPO-262 create pte theme

[msutya]

References

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• Fixes #issue-number (if this fixes an issue ticket)
• Requires DSpace/DSpace#pr-number (if a REST API PR is required to test this)

Description

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Checklist

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• My PR is small in size (e.g. less than 1,000 lines of code, not including comments & specs/tests), or I have provided reasons as to why that's not possible.
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• If my PR fixes an issue ticket, I've linked them together.

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If these changes are still relevant then please comment and/or rebase your PR based on the
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