Added custom icons for regular file types + typo fixes

[Emmaloto]

• Added icons to page header
• Fixed typos in code comments

• Added custom icons for common file types ⭐

  • mp4, avi, flv, swf, mov, mpg, mkv, webm, wmv

  • pdf, docx, doc, ppt, pptx, xls, xlsx, rtf, txt

  • jpg, jpeg, png, bmp, psd, jp2, gif, tif, tiff, ico, svg

  • mp3, wav, wma, flac, ogg, m4a

  • exe

  • zip, rar

All icons were obtained from System UIcons and UXWing which are open source and free for personal/comerical use without attribution.

[rlv-dan]

Looks very nice! When I make the next version I will definitely consider using this PR!