rename frontend to web and update contributing guide (#2509)

* rename frontend to web and update contributing guide

* rename this time

* fix build

* restructure rust code

* update documentation

* update descriptions

* Update CONTRIBUTING.md

Co-authored-by: J H <2364004+Blu-J@users.noreply.github.com>

---------

Co-authored-by: Aiden McClelland <me@drbonez.dev>
Co-authored-by: Aiden McClelland <3732071+dr-bonez@users.noreply.github.com>
Co-authored-by: J H <2364004+Blu-J@users.noreply.github.com>

core/startos/src/error.rs

@@ -0,0 +1,60 @@
+use color_eyre::eyre::eyre;
+pub use models::{Error, ErrorKind, OptionExt, ResultExt};
+
+#[derive(Debug, Default)]
+pub struct ErrorCollection(Vec<Error>);
+impl ErrorCollection {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn handle<T, E: Into<Error>>(&mut self, result: Result<T, E>) -> Option<T> {
+        match result {
+            Ok(a) => Some(a),
+            Err(e) => {
+                self.0.push(e.into());
+                None
+            }
+        }
+    }
+
+    pub fn into_result(self) -> Result<(), Error> {
+        if self.0.is_empty() {
+            Ok(())
+        } else {
+            Err(Error::new(eyre!("{}", self), ErrorKind::MultipleErrors))
+        }
+    }
+}
+impl From<ErrorCollection> for Result<(), Error> {
+    fn from(e: ErrorCollection) -> Self {
+        e.into_result()
+    }
+}
+impl<T, E: Into<Error>> Extend<Result<T, E>> for ErrorCollection {
+    fn extend<I: IntoIterator<Item = Result<T, E>>>(&mut self, iter: I) {
+        for item in iter {
+            self.handle(item);
+        }
+    }
+}
+impl std::fmt::Display for ErrorCollection {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        for (idx, e) in self.0.iter().enumerate() {
+            if idx > 0 {
+                write!(f, "; ")?;
+            }
+            write!(f, "{}", e)?;
+        }
+        Ok(())
+    }
+}
+
+#[macro_export]
+macro_rules! ensure_code {
+    ($x:expr, $c:expr, $fmt:expr $(, $arg:expr)*) => {
+        if !($x) {
+            return Err(crate::error::Error::new(color_eyre::eyre::eyre!($fmt, $($arg, )*), $c));
+        }
+    };
+}