Pre-process Audio folders to remove areas with silence / no speaking

[rphill299]

• [x] #33
• [x] UI component for removing silence ( or just automatic ? )
• [x] #34

[rphill299]

For now I plan on making this automatic. I will create a function that other endpoints can use if they want to dewhite

[rphill299]

testing proved fruitless, as it takes longer to dewhite and transcribe than to simply transcribe the original; abandoning this for now.