Redirect court case PDF filenames with spaces

[patphongs]

Filenames with spaces do not work in S3. We need to create redirects with those filenames with spaces to the new filename without spaces.

Related issue fecgov/fec-cms#4245

Completion criteria:

• Redirect filenames with spaces from www.fec.gov/resources/legal-resources/litigation/[old_filename_with_space] to the new content-s3 under path https://www.fec.gov/resources/legal-resources/litigation/[new_filename_no_spaces]