Changes required to build working Docker container (Windows 10 Pro WSL2)

[DrMikeJS]

Changed CRLF to LF in many if not most files

Replaced shortcuts in flower.conf files with contents of target conf file (shortcuts giving Apache error as "unrecognised command")

Replaced deprecated Django "url" function with "re_path" aliased as url for Django 4 compatibility.

Replaced NullBooleanField with BooleanField(null=True) for Django 4 compatibility.

Container now runs without errors.

[feathered-arch]

You da man!

[thecocce]

May be same issue of #427 and #433