refactor(tazjin/emacs): ivy,swiper,counsel -> vertico,consult

vertico and consult are more modern versions of interactive narrowing
helpers, as those implemented by ivy and its related packages.

The primary differences (and what I care about here) is that they are
more focused on integration with the core Emacs primitives, rather
than building an ecosystem around them.

For example:

* vertico enhances `completing-read' and friends, but does not attempt
  to provide its own ecosystem of functions to *trigger* completions.

* vertico integrates with the default `completion-style' system,
  meaning that I can continue to use things like prescient without
  extra packages that integrate it with vertico

* consult does not rely on vertico or any other specific completion
  framework (such as counsel/swiper do with ivy), and simply
  implements its functions using completing-read

This reduces the overall amount of code in the dependency closure and
leads to a less special setup.

Functionality is basically equivalent, except for two things which
counsel came with that I will need to substitute:

* counsel-notmuch (actually this was a separate package, but I didn't
  use it much anyways, so just ignoring it for now)
* counsel-linux-app (opening desktop shortcuts, this I will need to make)

As a side note, consult notes "This package is a part of GNU Emacs",
but it doesn't seem to be the case.

Change-Id: Ia046b763bf3d401b505e0f6393cfe1ccd6f41293
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9155
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

users/tazjin/emacs/default.nix

@@ -29,8 +29,7 @@ pkgs.makeOverridable
       clojure-mode
       cmake-mode
       company
-      counsel
-      counsel-notmuch
+      consult
       d-mode
       deft
       direnv
@@ -48,8 +47,6 @@ pkgs.makeOverridable
       ht
       hydra
       idle-highlight-mode
-      ivy
-      ivy-prescient
       jq-mode
       kotlin-mode
       kubernetes
@@ -76,7 +73,6 @@ pkgs.makeOverridable
       rust-mode
       sly
       string-edit-at-point
-      swiper
       telephone-line
       terraform-mode
       toml-mode
@@ -84,6 +80,7 @@ pkgs.makeOverridable
       undo-tree
       use-package
       uuidgen
+      vertico
       vterm
       web-mode
       websocket