0.5.6 relnotes updates

[jni]

Updates before final 0.5.6 release

• use ghifs with raw html to show video of polyline tool in action
• Add note about installing with napari[all]
• update date
• add remaining 0.5.6 PRs

[jni]

Grrr, looks like ghifs videos don't render on Firefox. 😢

[TimMonko]

Yes, not loading on Firefox for me either.

Btw L66 and L70 are duplicated, but it went let me comment

[Czaki]

use raw html like in 0.5.5 release notes

docs/docs/release/release_0_5_5.md

Line 38 in 995fb28

```{raw} html

[melissawm]

Can we convert this to a webm to make it fit? I feel so old I don´t even know what a ghif is 😭

[Czaki]

In general, when I open the link in Firefox browser, the film runs properly. So it is problem withe mebeding.

[jni]

use raw html like in 0.5.5 release notes

Yes, that means adding the file to the repo and using up our already-over-budget build size, though, so I try to avoid it. But I'll do it here.

I feel so old I don´t even know what a ghif is

@melissawm haha not ghif, ghifs, and don't worry it's not you, it's an obscure reference to this old Twitter thread:

[jni]

In general, when I open the link in Firefox browser, the film runs properly. So it is problem withe embedding.

That's interesting @Czaki. Indeed the caniuse for mp4 shows lots of green. Lemme try that first.

[jni]

New embed worked! 🥳 🚀

https://output.circle-artifacts.com/output/job/2b42a689-6186-4775-9ea3-d23e49d74356/artifacts/0/docs/docs/_build/html/release/release_0_5_6.html

If someone can approve and merge this I will push rc1. Should we then do a same day release or wait 24h?

[jni]

Should we then do a same day release or wait 24h?

If we do same day then I'll update this PR to remove the draft note.

[jni]

Should we then do a same day release or wait 24h?

I've reviewed my notifications and the milestone in more detail and I'm happier to just release quickly after rc1, so I removed the draft note. Any objections?

[jni]

@Czaki, any thoughts here?

[Czaki]

loks ok