Change frontmatter to be more standard

content/articles/2009/cq-world-wide-dx-rtty-2009.md

content/articles/2009/cq-world-wide-wpx-cw-2009.md

content/articles/2009/elektronicka-hraci-kostka.md

content/articles/2009/i-subregional-2009.md

...nt/articles/2009/iaru-hf-world-championship-2009-ol9hq.md

content/articles/2009/ii-subreginal-2009.md

...ent/articles/2009/jak-zacit-s-radioamaterskou-cinnosti.md

content/articles/2009/jota-joti-2009.md

content/articles/2009/kdo-driv-elektronicka-hra.md

...t/articles/2009/mistrovstvi-cr-v-radioelektronice-2009.md

content/articles/2009/navigamus-2009.md

content/articles/2009/obrok-2009.md

content/articles/2009/polni-den-2009.md

content/articles/2009/radioamaterske-destarero-hamspirit.md

.../soutez-deti-a-mladeze-v-elektronice-karlovy-vary-2009.md

content/articles/2009/terenni-profily-blatensky-vrch.md

content/articles/2009/test-stavebnic-prijimacu-na-kv.md

...09/toroidy-a-dvouotvorova-jadra-v-radioamaterske-praxi.md

content/articles/2009/velikonocni-zavod-2009.md

content/articles/2009/vhf-contest-2009.md