Fix Hugo config.toml as valid

[tnir]

Closes #10604

Fix a regression from #10485. We can't run make serve:

$ make serve
hugo server --ignoreCache --disableFastRender
Error: While parsing config: (10, 30): invalid escape sequence: \.
make: *** [serve] Error 255

Signed-off-by: Takuya Noguchi takninnovationresearch@gmail.com

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[tnir]

/kind bug
/cc @zacharysarah
/assign @Bradamant3
/assign @zacharysarah

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[zacharysarah]

@tnir Thanks for the fix! 🌟

/lgtm
/approve

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[tnir]

@zacharysarah Thanks. 🎉 If I remember correctly, I had pointed out this on #10485 a few days ago while we can't see it any more..