fix(fisher): remove magic-enter and clean up fisher plugin handling

conf.d/magic-enter.fish

@@ -1,25 +0,0 @@
-function magic-enter-cmd --description "Print the command to run when no command was given"
-    set -l cmd ls
-    if command git rev-parse --is-inside-work-tree &>/dev/null
-        set cmd "git status -sb"
-    end
-    echo $cmd
-end
-
-function magic-enter
-    set -l cmd (commandline)
-    if test -z "$cmd"
-        commandline -r (magic-enter-cmd)
-        commandline -f suppress-autosuggestion
-    end
-    commandline -f execute
-end
-
-function magic-enter-bindings --description "Bind magic-enter for default and vi key bindings"
-    bind \r magic-enter
-    if functions -q fish_vi_key_bindings
-        bind -M insert \r magic-enter
-        bind -M default \r magic-enter
-    end
-end
-magic-enter-bindings