Change spaces in filenames and directories to underscores

URL's don't look nice when directories or filenames contain spaces they are typically linked with ugly %20 in the URL making things hard to read easily.

I had uploaded a large directory of hundreds of files all containing spaces, here is what was used to fix those spaces.

Directories:

find . -exec rename -n 's/ /_/g' '{}' \;

Files:

find . -type f -exec rename -n 's/ /_/g' '{}' \;

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