Remove support and tests for PowerShell and Xonsh (not available on Alpine).

--- a/man/zoxide-init.1
+++ b/man/zoxide-init.1
@@ -43,23 +43,6 @@
 .sp
 You can replace \fB__zoxide_prompt\fR with a custom prompt.
 .TP
-.B powershell
-Add this to your configuration (the location is stored in \fI$profile\fR):
-.sp
-.nf
-    \fBInvoke-Expression (& {
-        $hook = if ($PSVersionTable.PSVersion.Major -lt 6) { 'prompt' } else { 'pwd' }
-        (zoxide init --hook $hook powershell) -join "`n"
-    })\fR
-.fi
-.TP
-.B xonsh
-Add this to your configuration (usually \fI~/.xonshrc\fR):
-.sp
-.nf
-    \fBexecx($(zoxide init xonsh), 'exec', __xonsh__.ctx, filename='zoxide')\fR
-.fi
-.TP
 .B zsh
 Add this to your configuration (usually \fI~/.zshrc\fR):
 .sp
--- a/src/app/init.rs
+++ b/src/app/init.rs
@@ -23,8 +23,6 @@
             InitShell::Fish => shell::Fish(opts).render(),
             InitShell::Nushell => shell::Nushell(opts).render(),
             InitShell::Posix => shell::Posix(opts).render(),
-            InitShell::Powershell => shell::Powershell(opts).render(),
-            InitShell::Xonsh => shell::Xonsh(opts).render(),
             InitShell::Zsh => shell::Zsh(opts).render(),
         }
         .context("could not render template")?;
--- a/src/shell.rs
+++ b/src/shell.rs
@@ -28,8 +28,6 @@
 make_template!(Fish, "fish.txt");
 make_template!(Nushell, "nushell.txt");
 make_template!(Posix, "posix.txt");
-make_template!(Powershell, "powershell.txt");
-make_template!(Xonsh, "xonsh.txt");
 make_template!(Zsh, "zsh.txt");
 
 #[cfg(feature = "shell_tests")]
@@ -273,6 +271,7 @@
     }
 
     #[rstest]
+    #[ignore]
     fn powershell_pwsh(
         #[values(None, Some("z"))] cmd: Option<&str>,
         #[values(InitHook::None, InitHook::Prompt, InitHook::Pwd)] hook: InitHook,
@@ -291,6 +290,7 @@
     }
 
     #[rstest]
+    #[ignore]
     fn xonsh_black(
         #[values(None, Some("z"))] cmd: Option<&str>,
         #[values(InitHook::None, InitHook::Prompt, InitHook::Pwd)] hook: InitHook,
@@ -310,6 +310,7 @@
     }
 
     #[rstest]
+    #[ignore]
     fn xonsh_mypy(
         #[values(None, Some("z"))] cmd: Option<&str>,
         #[values(InitHook::None, InitHook::Prompt, InitHook::Pwd)] hook: InitHook,
@@ -323,6 +324,7 @@
     }
 
     #[rstest]
+    #[ignore]
     fn xonsh_pylint(
         #[values(None, Some("z"))] cmd: Option<&str>,
         #[values(InitHook::None, InitHook::Prompt, InitHook::Pwd)] hook: InitHook,
@@ -342,6 +344,7 @@
     }
 
     #[rstest]
+    #[ignore]
     fn xonsh_xonsh(
         #[values(None, Some("z"))] cmd: Option<&str>,
         #[values(InitHook::None, InitHook::Prompt, InitHook::Pwd)] hook: InitHook,
--- a/src/app/_app.rs
+++ b/src/app/_app.rs
@@ -91,8 +91,6 @@
     Fish,
     Nushell,
     Posix,
-    Powershell,
-    Xonsh,
     Zsh,
 }