refactor: use Flask Blueprints to organize extensions

- extensions are now blueprints: keep views, templastes and statics in the same folder
- increase app security using `flask-talisman`
- whenever possible use {{ url_for }} for links between pages
- remove references to non-existing JavaScript code
- add missing favicon.ico

lnbits/core/__init__.py

@@ -0,0 +1,8 @@
+from flask import Blueprint
+
+
+core_app = Blueprint("core", __name__, template_folder="templates")
+
+
+from .views_api import *  # noqa
+from .views import *  # noqa

lnbits/core/templates/index.html

@@ -0,0 +1,98 @@
+<!-- @format -->
+
+{% extends "base.html" %} {% block menuitems %}
+
+           <li><a href="https://where39.com/"><p>Where39 anon locations</p><img src="static/where39.png" style="width:170px"></a></li>
+           <li><a href="https://github.com/arcbtc/Quickening"><p>The Quickening <$8 PoS</p><img src="static/quick.gif" style="width:170px"></a></li>
+           <li><a href="http://jigawatt.co/"><p>Buy BTC stamps + electronics</p><img src="static/stamps.jpg" style="width:170px"></a></li>
+           <li><a href="mailto:ben@arc.wales"><h3>Advertise here!</h3></a></li>
+{% endblock %} {% block body %}
+<!-- Right side column. Contains the navbar and content of the page -->
+<div class="content-wrapper">
+  <!-- Content Header (Page header) -->
+  <section class="content-header">
+    <ol class="breadcrumb">
+      <li>
+        <a href="{{ url_for('core.home') }}"><i class="fa fa-dashboard"></i> Home</a>
+      </li>
+    </ol>
+    <br /><br />
+    <div class="row">
+      <div class="col-md-6">
+    <div class="alert alert-danger alert-dismissable">
+      <h4>
+        TESTING ONLY - wallet is still in BETA and very unstable
+      </h4>
+    </div></div></div>
+  </section>
+
+  <!-- Main content -->
+  <section class="content">
+    <div class="row">
+      <div class="col-md-3">
+        <!-- Default box -->
+        <div class="box">
+          <div class="box-header">
+            {% block call_to_action %}
+            <h1>
+              <small>Make a wallet</small>
+            </h1>
+            <div class="form-group">
+              <input
+                type="text"
+                class="form-control"
+                id="walname"
+                placeholder="Name your LNBits wallet"
+                required
+              />
+            </div>
+            <button type="button" class="btn btn-primary" onclick="newwallet()">
+              Submit
+            </button>
+            {% endblock %}
+          </div>
+          <!-- /.box-body -->
+        </div>
+        <!-- /.box -->
+      </div>
+    </div>
+    <div class="row">
+      <div class="col-md-6">
+        <!-- Default box -->
+        <div class="box">
+          <div class="box-header">
+            <h1>
+              <a href="index.html" class="logo"><b>LN</b>bits</a>
+              <small>free and open-source lightning wallet</small>
+            </h1>
+            <p>
+              LNbits is a simple, free and open-source lightning-network wallet
+              for bits and bobs. You can run it on your own server, or use this
+              one.
+              <br /><br />
+              The wallet can be used in a variety of ways, an instant wallet for
+              LN demonstrations, a fallback wallet for the LNURL scheme, an
+              accounts system to mitigate the risk of exposing applications to
+              your full balance.
+              <br /><br />
+              The wallet can run on top of LND, lntxbot, paywall, opennode
+              <br /><br />
+              Please note that although one of the aims of this wallet is to
+              mitigate exposure of all your funds, it’s still very BETA and may
+              in fact do the opposite!
+              <br />
+              <a href="https://github.com/arcbtc/lnbits"
+                >https://github.com/arcbtc/lnbits</a
+              >
+            </p>
+          </div>
+          <!-- /.box-body -->
+        </div>
+        <!-- /.box -->
+      </div>
+    </div>
+  </section>
+  <!-- /.content -->
+</div>
+<!-- /.content-wrapper -->
+{% endblock %}

lnbits/core/views.py

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+from flask import render_template, send_from_directory
+from os import path
+
+from lnbits.core import core_app
+
+
+@core_app.route("/favicon.ico")
+def favicon():
+    return send_from_directory(path.join(core_app.root_path, "static"), "favicon.ico")
+
+
+@core_app.route("/")
+def home():
+    return render_template("index.html")