feat: add basic error handling

Add anyhow::Result<()> return signature to all scripts and main.

src/scripts/django.rs

@@ -1,19 +1,20 @@
+use anyhow::Result;
 use std::path::PathBuf;
 
-pub fn make_command(app: &PathBuf, command: &str) {
+pub fn make_command(app: &PathBuf, command: &str) -> Result<()> {
     println!("{app:?} and {command:?}");
     todo!()
 }
-pub fn makemigrations() {
+pub fn makemigrations() -> Result<()> {
     todo!()
 }
-pub fn manage(command: &[String]) {
+pub fn manage(command: &[String]) -> Result<()> {
     println!("{command:?}");
     todo!()
 }
-pub fn migrate() {
+pub fn migrate() -> Result<()> {
     todo!()
 }
-pub fn shell() {
+pub fn shell() -> Result<()> {
     todo!()
 }