move small sections into YAML front matter
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This makes it more immediately visible to users reading the proposal by email or just browsing the website. Things like "affected users", "approval" and "deadline" are particularly things that rarely require a whole paragraph to describe. This also makes the contents greppable, which is particularly relevant for the Status field, which could now be used for automatic generation. That front matter is not currently very well displayed by GitLab wikis, but it's relatively readable. I have *tried* to move the "Summary" in there as well, but the formatting gets ugly quickly, as we need to use line continuation hacks. Besides, it looks better in the wiki that way. I have tried to do this automatically macros, but alas the format was too irregular so I had to actually do this manually, which means I also tweaked other things as I went along. Hopefully the format will make future work like this much easier.