Fix version updates badge contrast in dark mode and make this section full-width, below Migrations

[jaimergp]

PR Checklist:

• [X] note any issues closed by this PR with closing keywords
• [ ] if you are adding a new page under docs/ or community/, you have added it to the sidebar in the corresponding _sidebar.json file
• [ ] put any other relevant information below

Part of https://github.com/conda-forge/conda-forge.github.io/issues/2289

cc @beckermr

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[beckermr]

This is fantastic! Can we make the historical outages collapsable?

[jaimergp]

Can we make the historical outages collapsable?

Check it out. I collapsed them by default, but we can also make it expanded by default. Let me know what you prefer.

[beckermr]

That's fantastic! Thank you!

[jaimergp]

@beckermr, what do you think about merging this one for the "style" changes only, and then I tackle the queued versions in a PR once the v2 files are available?

[jaimergp]

nvm it's there already, I'll add it here