Favicon, SMTP and misc updates

Favicon:
- Replaced HTML tokenizer, much faster now.
- Caching the domain blacklist function.
- Almost all functions are async now.
- Fixed bug on minimizing data to parse
- Changed maximum icon download size to 5MB to match Bitwarden
- Added `apple-touch-icon.png` as a second fallback besides `favicon.ico`

SMTP:
- Deprecated SMTP_SSL and SMTP_EXPLICIT_TLS, replaced with SMTP_SECURITY

Misc:
- Fixed issue when `resolv.conf` contains errors and trust-dns panics (Fixes #2283)
- Updated Javscript and CSS files for admin interface
- Fixed an issue with the /admin interface which did not cleared the login cookie correctly
- Prevent websocket notifications during org import, this caused a lot of traffic, and slowed down the import.
  This is also the same as Bitwarden which does not trigger this refresh via websockets.

Rust:
- Updated to use v1.59
- Use the new `strip` option and enabled to strip `debuginfo`
- Enabled `lto` with `thin`
- Removed the strip RUN from the alpine armv7, this is now done automatically

src/api/admin.rs

@@ -301,7 +301,7 @@ fn test_smtp(data: Json<InviteData>, _token: AdminToken) -> EmptyResult {
 
 #[get("/logout")]
 fn logout(cookies: &CookieJar<'_>, referer: Referer) -> Redirect {
-    cookies.remove(Cookie::named(COOKIE_NAME));
+    cookies.remove(Cookie::build(COOKIE_NAME, "").path(admin_path()).finish());
     Redirect::to(admin_url(referer))
 }
 
@@ -638,7 +638,7 @@ impl<'r> FromRequest<'r> for AdminToken {
 
             if decode_admin(access_token).is_err() {
                 // Remove admin cookie
-                cookies.remove(Cookie::named(COOKIE_NAME));
+                cookies.remove(Cookie::build(COOKIE_NAME, "").path(admin_path()).finish());
                 error!("Invalid or expired admin JWT. IP: {}.", ip);
                 return Outcome::Forward(());
             }