Link to release from version number in footer

### Prerequisites

- [x] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions) and found no answer

- [x] I have searched other issues and found no duplicates

- [x] I want to request a feature or enhancement and not ask a question

### The problem

I have AdGuard set to auto-update (via Watchtower). When a new version is installed, I'm often curious what's changed. Right now, I have to navigate to the GitHub repo and find the release that matches the version number in the footer of my instance.

### Proposed solution

Update the version number in the footer to link to `https://github.com/AdguardTeam/AdGuardHome/releases/tag/vX.X.X` where `X.X.X` is the version number.

### Alternatives considered and additional information

I'd be happy to take a pass at a PR (and would be eager to make my first contribution) if someone could help point me in the right direction.