Initial commit: Paperwall, a standalone e-ink dashboard

Navidrome now-playing, clock, and weather for a Waveshare epd4in0e panel,
with a local web UI and install/uninstall scripts for the Pi.

web/templates/settings_navidrome.html

@@ -0,0 +1,37 @@
+{% extends "base.html" %}
+{% block content %}
+<h1>Navidrome</h1>
+<form method="post">
+  <div class="field">
+    <label for="url">Server URL</label>
+    <input type="text" id="url" name="url" value="{{ settings.url or '' }}" placeholder="https://music.example.com">
+  </div>
+  <div class="field">
+    <label for="username">Username</label>
+    <input type="text" id="username" name="username" value="{{ settings.username or '' }}">
+  </div>
+  <div class="field">
+    <label for="password">Password</label>
+    <input type="password" id="password" name="password" value="{{ settings.password or '' }}">
+  </div>
+  <div class="field">
+    <label for="filter_user">Only show this listener (optional)</label>
+    <input type="text" id="filter_user" name="filter_user" value="{{ settings.filter_user or '' }}">
+  </div>
+
+  <div class="field">
+    <label>Display options</label>
+    <label class="checkbox"><input type="checkbox" name="show_progress" {{ "checked" if settings.show_progress }}> Progress bar and times</label>
+    <label class="checkbox"><input type="checkbox" name="show_genre" {{ "checked" if settings.show_genre }}> Genre</label>
+    <label class="checkbox"><input type="checkbox" name="show_source" {{ "checked" if settings.show_source }}> Player and listener name</label>
+  </div>
+
+  <div class="field">
+    <label>Cover art</label>
+    <label class="checkbox"><input type="checkbox" name="boost_cover" {{ "checked" if settings.boost_cover }}> Boost contrast for e-ink</label>
+    <label class="checkbox"><input type="checkbox" name="grayscale_cover" {{ "checked" if settings.grayscale_cover }}> Force grayscale</label>
+  </div>
+
+  <button type="submit">Save</button>
+</form>
+{% endblock %}