make unconference page more readable

[bast]

• two important links are on top as buttons
• announcement texts moved to sub-page
• consent-type information for speakers moved to issue template
• overall less text to read

[bast]

Just a sec I will attach a screenshot to make it easier to review ...

[bast]

[bast]

The schedule could get better formatting but that's for another PR.

[lucaferranti]

for the schedule, I suggest to use the <summary> and <details> tag, so that one can expand the abstract if they want

[lucaferranti]

inspiration: https://juliareach.github.io/juliareach-days-3/#program

[bast]

Good idea but let's move that to a new issue that somebody can take?

[bast]

I am creating issue ...

[bast]

I am creating issue ...

followed-up in #392

[lucaferranti]

Good idea but let's move that to a new issue that somebody can take?

absolutely, I think this PR fullfills its purpose