Change display of FREE to ALL TIERS in badges

When we say a feature is "FREE", we actually means available at the "FREE tier and above".

For our docs, this would be clearer if the badges said "ALL TIERS" instead of "FREE".

Some example:

• Administration landing page (badge on an H1):
  • Before: https://docs.gitlab.com/ee/administration/
  • After: http://eread-free-tier-means-all-tiers.178.62.207.141.nip.io/ee/administration/index.html
• File hooks (badge on H1, no qualifier badge):
  • Before: https://docs.gitlab.com/ee/administration/file_hooks.html
  • After: http://eread-free-tier-means-all-tiers.178.62.207.141.nip.io/ee/administration/file_hooks.html
• LDAP Security section (badge on H2):
  • Before: https://docs.gitlab.com/ee/administration/auth/ldap/index.html#security
  • After: http://eread-free-tier-means-all-tiers.178.62.207.141.nip.io/ee/administration/auth/ldap/index.html#security
• audit_json.log (badge on H2, no qualifier badge)
  • Before: https://docs.gitlab.com/ee/administration/logs.html#audit_jsonlog
  • After: http://eread-free-tier-means-all-tiers.178.62.207.141.nip.io/ee/administration/logs.html#audit_jsonlog
• Mouse over badge:

  • Before (https://docs.gitlab.com/ee/api/api_resources.html#standalone-resources):

    

  • After (http://eread-free-tier-means-all-tiers.178.62.207.141.nip.io/ee/api/api_resources.html#standalone-resources):

    

Closes: technical-writing#390.