For learning Sitelen Pona on mobile

Check app at: https://brunobord.github.io/o-kama-sona-e-sitelen-pona/

(Based on: https://whtspc.github.io/ - source code on: https://github.com/whtspc/whtspc.github.io)

• Cleaned up unused files & dead code
• Upgraded linja pona font from 3.5 to 4.9. This font includes the latest nimi ku suli and other glyphs.
• Changed font and switched to nasin pona font v3.1.0
• Added the missing nimi ku suli (namako, kipisi, monsuta, leko, tonsi, jasima, soko, meso, epiku, kokosila, lanpan, n, misikeke, ku)
• Added keyboard input