New dashboard and buffer/window management

1. New dashboard.
2. New buffer/window management with persp-mode.
3. Add company-box: icons and quickhelp in company.
4. Enhance lsp-mode.
5. Use forge instead of magithub.
6. Nice writing: olivetti to replace darkroom-mode.
7. Remove centaur-company-enable-yas.
8. Remove cnfonts.
9. Remove regexp-fuzzy from ivy builders.
10. Add 1fancy-narrow`.
11. Other enhancements.
12. Bug fix.