convert meta and tag directives to TOML frontmatter

command:
```
find * -type f -name '*.md' -execdir perl -MTOML::Tiny=to_toml -C63 -gni -E '%x=();s/\[\[!meta\s+(title|date)="?([^\]"]+?)\s*"?\s*\]\]\s*\n*/$x{$1}=$2;""/eg; s/\[\[!meta\s+stylesheet="?edu"?\s+rel="?stylesheet"?\s*\]\]\n*/$x{taxonomies}{categories}=["education"];""/e; s/\[\[!tag((?:\s+[^\]\s]+)+)\s*\]\]\n*/push @{$x{taxonomies}{tags}}, $1=~m{\S+}g;""/eg; s/\[\[!meta\s+(?:author|name)="?([^\]"]+?)\s*"?\s*\]\]\s*\n*/$x{extra}{author}=$1;""/eg; say "+++"; say to_toml({%x}); say "+++"; say $_' '{}' +
```

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