chore: remove flox environment support

Flox added setup complexity without being the default or
widely used. Use make tools-setup instead.

Author: mchmarny

.envrc

@@ -1,24 +1,3 @@
-# Activate Flox environment if flox is installed
-if command -v flox &> /dev/null; then
-    use_flox() {
-        if [[ ! -d ".flox" ]]; then
-            printf "direnv(use_flox): \`.flox\` directory not found\n" >&2
-            printf "direnv(use_flox): Did you run \`flox init\` in this directory?\n" >&2
-            return 1
-        fi
-
-        direnv_load flox activate "$@" -- "$direnv" dump
-
-        if [[ $# == 0 ]]; then
-            watch_dir ".flox/env/"
-            watch_file ".flox/env.json"
-            watch_file ".flox/env.lock"
-        fi
-    }
-
-    use_flox
-fi
-
 # Source local overrides if present
 if [[ -f .envrc.local ]]; then
     source .envrc.local