Wip ldap

This will allow for LDAP authentication by creating a file `/usr/local/share/RackTables/wwwroot/.htaccess` with content like

```
AuthBasicProvider ldap
AuthType Basic
AuthName "Restricted"
require ldap-attribute objectClass=posixAccount
AuthzLDAPAuthoritative on
AuthLDAPURL ldap://ldap.example.org/ou=users,dc=example,dc=org?uid
Require valid-user
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