Change frontmatter to be more standard

content/articles/2008/i-subregional-2008.md

content/articles/2008/iaru-hf-world-championship-ol4hq.md

content/articles/2008/jednoduchy-smd-blikac.md

content/articles/2008/jota-joti-2008.md

content/articles/2008/klic-2008.md

content/articles/2008/led-semafor.md

...ent/articles/2008/memorial-om3au-mikrovlnny-zavod-2008.md

content/articles/2008/nordic-activity-contest-3-2008.md

content/articles/2008/odkazy-uzitecne-pri-zavodeni.md

content/articles/2008/ok-om-dx-contest-2008.md

content/articles/2008/ok0e-a-ok0be.md

content/articles/2008/ovladani-jednim-tlacitkem.md

content/articles/2008/pile-up-nanecisto-v-mp3.md

content/articles/2008/polni-den-2008.md

content/articles/2008/pracujeme-v-eagle-1cast-zaciname.md

...cles/2008/pracujeme-v-eagle-2-cast-vytvarime-3d-nahled.md

...rticles/2008/pracujeme-v-eagle-3cast-export-gerber-dat.md

content/articles/2008/provozni-aktiv-2-2008.md

content/articles/2008/provozni-aktiv-3-2008.md

content/articles/2008/provozni-aktiv-6-2008.md