mod_http_oauth2: Remove broken in-CSS templating Because util.interpolation with a "%b{}" pattern only matches the outer brackets, so variables inside them would not work unless the pattern is changed (also considered).

This module lets you block connections to any remote servers not on a
whitelist.

``` {.lua}
modules_enabled = {
    -- other modules --
    "s2s_whitelist",

}
s2s_whitelist = {
    "example.org",
}
```