Change frontmatter to be more standard

content/articles/2008/provozni-aktiv-9-2008.md

content/articles/2008/radioskauting.md

content/articles/2008/radiovy-orientacni-beh-krasno-2008.md

content/articles/2008/radiovy-orientacni-beh-liboc-2008.md

...cles/2008/radiovy-orientacni-beh-materske-centrum-2008.md

content/articles/2008/reprezentacni-stanice-ol4hq.md

content/articles/2008/skautska-sobota-nejdek-prezentace.md

.../soutez-deti-a-mladeze-v-elektronice-karlovy-vary-2008.md

content/articles/2008/svetelny-had-s-10-led.md

content/articles/2008/uhf-contest-2008.md

...cles/2008/univerzalni-programator-mikroprocesoru-atmel.md

content/articles/2008/velikonocni-zavod-2008.md

content/articles/2008/vyroba-plosnych-spoju.md

content/articles/2008/zapadoceska-zirafa-2008.md

...ent/articles/2008/zavod-vlcat-a-svetlusek-v-teple-2008.md

content/articles/2008/zavodime-s-win-testem-1-cast-uvod.md

content/articles/2008/zesilovac-s-lm386.md

content/articles/2009/adrenalin-2009.md

content/articles/2009/antenni-analyzer-vk5jst.md

content/articles/2009/bambiriada-2009.md