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 $_' '{}' +
```

1 files changed, 17 insertions, 4 deletions

diff --git a/andersen_eventyrkbh/index.md b/andersen_eventyrkbh/index.md
index 0c2cab10..63d9f9d5 100644
--- a/andersen_eventyrkbh/index.md
+++ b/andersen_eventyrkbh/index.md
@@ -1,5 +1,20 @@
-[[!meta title="H.C. Andersens eventyr i København"]]
-
++++
+date=2019-03-17
+title="H.C. Andersens eventyr i København"
+
+[taxonomies]
+tags=[
+  "historie",
+  "city",
+  "ture",
+  "personer",
+  "tema",
+  "litteratur",
+  "hc_andersen",
+  "guldalder",
+  "1800-tallet",
+]
++++
 [[!if test="included()" then="""
 {{ img(path="hcaskorstenskyline.jpg" class="overview" size="200x" link="/andersen_eventyrkbh") }}
 
@@ -39,6 +54,4 @@ Turen fører os til steder, der kunne være kulisser til eventyrene. Samtidig hÃ
 
 """]]
 
-[[!tag historie city ture personer tema litteratur hc_andersen guldalder 1800-tallet]]
 
-[[!meta date="2019-03-17"]]