Switch to default completion UI

Mostly to avoid icomplete jank (bug#40152).

Inspired by:
<https://www.scss.tcd.ie/~sulimanm/posts/default-emacs-completion.html>

Rationale for the customizations:

C-M- chord for navigation   Because I found myself missing C-n/C-p in
                            a couple of situations.

auto-help 'visible          The feedback is not as immediate as
                            icomplete, but it's good enough.  Tried
                            'always, but there's a sit-for somewhere
                            that causes a weird pause if you happen to
                            RET before bringing up completions.

auto-select 'second-tab     M-v?  M-g M-c??

show-help nil               "Click on a selection to select it" 😏

format 'one-column          Where have you been all my life.

max-height 10               More often than not I'm typing something
                            inspired by the content from another
                            buffer, so limit how much
                            context *Completions* can hide.

auto-choose                 icomplete never clobbered the minibuffer
                            until I asked it to (with e.g. C-M-i).
                            Since C-u M-RET is a thing, keep
                            candidates off the minibuffer unless I
                            pull them in, in case I change my mind and
                            start typing something entirely different
                            from the currently highlighted candidate.

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