[BUG] RSS link has incorrect `type`

[giggio]

Describe the bug

RSS link is showing as:

<link rel="alternate" type="application/rss&#43;xml" href="http://localhost:1313/index.xml">

application/rss+xml is incorrect.

To reproduce

Steps to reproduce the behavior:

1. Run theme
2. See error

Expected behavior

<link rel="alternate" type="application/rss+xml" href="https://localhost:1313/index.xml">

Log file

N/A.

Screenshots

N/A.

Host environment

Please complete the following information where applicable.

• Hinode version: [e.g. v0.11.3]
• Host OS: [e.g. macOS Ventura 13.3]
• Node version: [e.g. node v18.15.0]
• Browser: [e.g. Google Chrome Version 108.0.5359.124 (Official Build) (arm64)]

Host environment

• Hinode version: v1.6.3
• Host OS: Ubuntu 24.04
• Node version: 24.1.0
• Browser: [Brave 1.79.119 (Official Build) (64-bit)](https://brave.com/latest/) | Chromium: 137.0.7151.68

Hugo environment

hugo v0.147.7+extended+withdeploy linux/amd64 BuildDate=unknown VendorInfo=nixpkgs
GOOS="linux"
GOARCH="amd64"
GOVERSION="go1.24.3"
github.com/sass/libsass="3.6.6"
github.com/webmproject/libwebp="v1.3.2"

Additional context

Adding the title attribute would be a nice addition! :)