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/static_resources.rs

@@ -0,0 +1,23 @@
+use actix_web::{get, web, HttpResponse};
+use askama::Template;
+use std::marker::PhantomData;
+
+#[derive(Template)]
+#[template(path = "water.css", escape = "none")]
+struct WaterCSS<'a> {
+    _marker: PhantomData<&'a ()>,
+}
+
+#[get("/static/{resource}")]
+pub async fn static_resources(resource_id: web::Path<String>) -> HttpResponse {
+    match resource_id.into_inner().as_str() {
+        "water.css" => HttpResponse::Found().content_type("text/html").body(
+            WaterCSS {
+                _marker: Default::default(),
+            }
+            .render()
+            .unwrap(),
+        ),
+        _ => HttpResponse::NotFound().content_type("text/html").finish(),
+    }
+}