Add fonts and other improvements

[bryanhce]

Other improvements include:

• clipping video to be same length as audio mp3 generated
• clean up code and remove redundancy
• added test base video titled base_0.mp4 of 10 seconds long
• added remove_repeated_punctuations function to clean up reddit content, eg hello??? to hello?
• strip white space from all words to better centralise the subtitles in the video