[Enhancement] Add Apprise support (#170)

* [WIP] add settings sidebar entry and placeholder page

* [WIP] added placeholder UI and logic for settings form

* Added column and UI for apprise server

* Add some tests

* Added placeholder command runner for apprise

* [WIP] Adding apprise package

* Added apprise command runner

* Hooked up apprise notification module

* Ensured apprise was running in verbose mode

* Updated wording of apprise notification

* Added apprise to README

lib/pinchflat_web/controllers/settings/setting_html/show.html.heex

@@ -0,0 +1,12 @@
+<div class="mb-6 flex gap-3 flex-row items-center justify-between">
+  <div class="flex gap-3 items-center">
+    <h2 class="text-title-md2 font-bold text-black dark:text-white ml-4">
+      Settings
+    </h2>
+  </div>
+</div>
+<div class="rounded-sm border border-stroke bg-white px-5 py-5 shadow-default dark:border-strokedark dark:bg-boxdark sm:px-7.5">
+  <div class="max-w-full overflow-x-auto">
+    <.setting_form changeset={@changeset} action={~p"/settings"} />
+  </div>
+</div>