Update TIC-80 Homepage URL

[gaeulbyul]

TIC-80 changed its homepage URL to tic80.com, and old domain(tic.computer) is unavailable at now.

• https://github.com/nesbox/TIC-80/commit/20aa9e086685e407fc6bec080e7f8625c685340c
• https://github.com/nesbox/TIC-80/commit/8f6dca8e4e7f3c079b23b3f5a8bd4bc10f132c29