Add optional seed argument to shuffle

[bep]

See https://discourse.gohugo.io/t/make-shuffle-show-different-posts-per-post/35900

[jmooring]

The lack of randomization in the referenced forum topic was due to a cached partial.

The current shuffle seed is time.Now().UTC().UnixNano().

1. The UTC() conversion is not necessary.
2. I don't understand how shuffle random seed #4337 had any beneficial effect.
3. Are there cases where the current seed is insufficient?

I'm not against adding an arg, I just haven't encountered a problem with this before.

[bep]

Are there cases where the current seed is insufficient?

The current seed is fine, but there are 2 situations where I imagine a custom seed would be useful.

1. If you want a more stable shuffle (same order on every build), just pass in 42 or something as the seed.
2. You want new shuffle on each build, but slightly different between the sections ...

[bep]

Never mind, I'm not sure this is a great idea ...

[github-actions]

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