[Enhancement] Support for footer menu

[br4yd]

What does this PR change? What problem does it solve?
This PR adds support of the footer menus, that are described in Hugo's documentation here. When rendered it looks something like in this example as seen on this screenshot:

Links are separated by " · ". This does not get printed after the last footer link of course to only have this separator between links and not after links.

In my case, working with a toml config, I had this menu defined as:

[[menu.footer]]
name = "Imprint"
url = "/imprint"
weight = 10

[[menu.footer]]
name = "Privacy Policy"
url = "/privacy-policy"
weight = 20

Was the change discussed in an issue or in the Discussions before?
Not that I am aware off. I just saw #1481, but this behaves differently from my PR as far as I understand.

PR Checklist

• This change adds/updates translations and I have used the template present here.
• I have enabled maintainer edits for this PR.
• I have verified that the code works as described/as intended.
• This change adds a Social Icon which has a permissive license to use it.
• This change does not include any CDN resources/links.
• This change does not include any unrelated scripts such as bash and python scripts.
• This change updates the overridden internal templates from HUGO's repository.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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