Remove any mentions to self-host

src/client.rs

@@ -19,8 +19,8 @@ static CLOUD_URL: &str = "https://cloud.axiom.co";
 /// use axiom_rs::{Client, Error};
 ///
 /// fn main() -> Result<(), Error> {
-///     // Create a new client and get the token, url and (if necesary) org id
-///     // from the environment variables AXIOM_TOKEN, AXIOM_URL and AXIOM_ORG_ID.
+///     // Create a new client and get the token and (if necesary) org id
+///     // from the environment variables AXIOM_TOKEN and AXIOM_ORG_ID.
 ///     let client = Client::new()?;
 ///
 ///     // Set all available options. Unset options fall back to environment
@@ -95,14 +95,6 @@ impl Builder {
         self
     }
 
-    /// Add an URL to the client. If this is not set, the URL will be read
-    /// from the environment variable `AXIOM_URL`. If that is empty as well,
-    /// it will fall back to Axiom Cloud.
-    pub fn with_url<S: Into<String>>(mut self, url: S) -> Self {
-        self.url = Some(url.into());
-        self
-    }
-
     /// Add an organization ID to the client. If this is not set, the
     /// organization ID will be read from the environment variable `AXIOM_ORG_ID`.
     pub fn with_org_id<S: Into<String>>(mut self, org_id: S) -> Self {