feat: Added fancy bootstrap UI

test.py

@@ -1,9 +1,12 @@
 #!/usr/bin/env python3
-from flask import Flask, request, send_file
+from flask import Flask, request, send_file, send_from_directory, render_template
+from flask_wtf.csrf import CSRFProtect
 from xlsx_replacement import XlsxReplacement
 from pdf_merger import PdfMerger
 
-app = Flask(__name__)
+app = Flask(__name__, template_folder='html')
+app.config['SECRET_KEY'] = 'TOP SECRET'
+csrf = CSRFProtect(app)
 
 
 @app.route('/pdf-test/pdf_replace', methods=['POST'])
@@ -20,6 +23,13 @@ def test_upload():
     return send_file(out, mimetype='application/pdf', attachment_filename=request.files['pdf'].filename)
 
 
+@app.route("/pdf-test/<path:path>")
+def static_files(path: str):
+    if path.endswith('.html'):
+        return render_template(path)
+    return send_from_directory('html', path)
+
+
 @app.route('/pdf-test/testpage')
 def test_page():
     return """