Added some functions to board

>>New stuff:
+ new block
+ delete block
+ reset (clear board)
+ background color changer (burnt a lot of time getting this right)
>>To add:
+ Reset changes (encountered an issue)
+ Add Text
+ Change block colour
>> Note:
- there's a weird bug in my console log, saying "Uncaught SyntaxError:
Illegal return statement" on the index page. Any idea what's causing it?