feat: Kl 15 rebrand the new workbench [old]

[that-bman]

• Rebrand the Langflow code to use the Kendra Labs logos.
• Secondary task is to update the copy so ‘Langflow’ is replaced by ‘Kendra Labs’

Out of scope:

Any references to langflow in the code e.g. key names, variable names etc.

Any urls that point to langflow or anywhere else - these can be addressed later

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