disabled-packages: remove obsolete version of 'caddy'

We have up-to-date 'caddy' as enabled package.

disabled-packages/caddy/build.sh

@@ -1,4 +0,0 @@
-TERMUX_PKG_HOMEPAGE=https://github.com/mholt/caddy
-TERMUX_PKG_DESCRIPTION="Fast, cross-platform HTTP/2 web server with automatic HTTPS"
-TERMUX_PKG_VERSION=0.8.0
-TERMUX_PKG_SRCURL=https://github.com/mholt/caddy/archive/v${TERMUX_PKG_VERSION}.tar.gz