Multiple enhancements and bugfixes

!Breaking change! - The updated version will not be able to read your old database file

Major improvements:
- Added editable pastas
- Added private pastas
- Added line numbers
- Added support for wide mode (1080p instead of 720p)
- Added syntax highlighting support
- Added read-only mode
- Added built-in help page
- Added option to remove logo, change title and footer text

Minor improvements:
- Improved looks in pure html mode
- Removed link to GitHub repo from navbar
- Broke up 7km long main.rs file into smaller modules
- Moved water.css into a template instead of serving it as an external resource
- Made Save button a bit bigger
- Updated README.MD

Bugfixes:
- Fixed a bug where an incorrect animal ID in a request would cause a crash
- Fixed a bug where an empty or corrupt JSON database would cause a crash

src/endpoints/pastalist.rs

@@ -0,0 +1,38 @@
+use actix_web::{get, web, HttpResponse};
+use askama::Template;
+
+use crate::args::{Args, ARGS};
+use crate::pasta::Pasta;
+use crate::util::misc::remove_expired;
+use crate::AppState;
+
+#[derive(Template)]
+#[template(path = "pastalist.html")]
+struct PastaListTemplate<'a> {
+    pastas: &'a Vec<Pasta>,
+    args: &'a Args,
+}
+
+#[get("/pastalist")]
+pub async fn list(data: web::Data<AppState>) -> HttpResponse {
+    if ARGS.no_listing {
+        return HttpResponse::Found()
+            .append_header(("Location", "/"))
+            .finish();
+    }
+
+    let mut pastas = data.pastas.lock().unwrap();
+
+    pastas.retain(|p| !p.private);
+
+    remove_expired(&mut pastas);
+
+    HttpResponse::Found().content_type("text/html").body(
+        PastaListTemplate {
+            pastas: &pastas,
+            args: &ARGS,
+        }
+        .render()
+        .unwrap(),
+    )
+}