Add `category` property to each .md file for the webpage (#1818)
Add `category` property to each .md file for the webpage (#1818)

JerryScript-DCO-1.0-Signed-off-by: Zsolt Borbély zsborbely.u-szeged@partner.samsung.com
gabrielschulhof/jerryscript,jack60504/jerryscript,zherczeg/jerryscript,jerryscript-project/jerryscript,glistening/jerryscript,yichoi/jerryscript,jerryscript-project/jerryscript,robertsipka/jerryscript,grgustaf/jerryscript,LaszloLango/jerryscript,gabrielschulhof/jerryscript,bzsolt/jerryscript,bzsolt/jerryscript,bsdelf/jerryscript,jack60504/jerryscript,grgustaf/jerryscript,robertsipka/jerryscript,bsdelf/jerryscript,grgustaf/jerryscript,bzsolt/jerryscript,dbatyai/jerryscript,martijnthe/jerryscript,akosthekiss/jerryscript,bsdelf/jerryscript,dbatyai/jerryscript,grgustaf/jerryscript,LaszloLango/jerryscript,glistening/jerryscript,grgustaf/jerryscript,glistening/jerryscript,dbatyai/jerryscript,jerryscript-project/jerryscript,jack60504/jerryscript,gabrielschulhof/jerryscript,jerryscript-project/jerryscript,robertsipka/jerryscript,glistening/jerryscript,martijnthe/jerryscript,jack60504/jerryscript,gabrielschulhof/jerryscript,martijnthe/jerryscript,zherczeg/jerryscript,martijnthe/jerryscript,LaszloLango/jerryscript,jack60504/jerryscript,gabrielschulhof/jerryscript,zherczeg/jerryscript,jerryscript-project/jerryscript,bzsolt/jerryscript,grgustaf/jerryscript,glistening/jerryscript,dbatyai/jerryscript,robertsipka/jerryscript,akosthekiss/jerryscript,dbatyai/jerryscript,akosthekiss/jerryscript,zherczeg/jerryscript,glistening/jerryscript,yichoi/jerryscript,LaszloLango/jerryscript,martijnthe/jerryscript,martijnthe/jerryscript,yichoi/jerryscript,bsdelf/jerryscript,yichoi/jerryscript,bzsolt/jerryscript,bsdelf/jerryscript,zherczeg/jerryscript,jack60504/jerryscript,robertsipka/jerryscript,bsdelf/jerryscript,robertsipka/jerryscript,yichoi/jerryscript,akosthekiss/jerryscript,LaszloLango/jerryscript,akosthekiss/jerryscript