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

.env.template

@@ -331,9 +331,8 @@
 # SMTP_HOST=smtp.domain.tld
 # SMTP_FROM=vaultwarden@domain.tld
 # SMTP_FROM_NAME=Vaultwarden
+# SMTP_SECURITY=starttls # ("starttls", "force_tls", "off") Enable a secure connection. Default is "starttls" (Explicit - ports 587 or 25), "force_tls" (Implicit - port 465) or "off", no encryption (port 25)
 # SMTP_PORT=587          # Ports 587 (submission) and 25 (smtp) are standard without encryption and with encryption via STARTTLS (Explicit TLS). Port 465 is outdated and used with Implicit TLS.
-# SMTP_SSL=true          # (Explicit) - This variable by default configures Explicit STARTTLS, it will upgrade an insecure connection to a secure one. Unless SMTP_EXPLICIT_TLS is set to true. Either port 587 or 25 are default.
-# SMTP_EXPLICIT_TLS=true # (Implicit) - N.B. This variable configures Implicit TLS. It's currently mislabelled (see bug #851) - SMTP_SSL Needs to be set to true for this option to work. Usually port 465 is used here.
 # SMTP_USERNAME=username
 # SMTP_PASSWORD=password
 # SMTP_TIMEOUT=15

.pre-commit-config.yaml

@@ -1,7 +1,7 @@
 ---
 repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.0.1
+    rev: v4.1.0
     hooks:
     - id: check-yaml
     - id: check-json