Update dependencies and add book index route

Updated `Pipfile.lock` to specify Python 3.8 and added
dependencies including `click`, `flask`, `itsdangerous`,
`jinja2`, `markupsafe`, `python-dotenv`, and `werkzeug`
with version constraints and hashes.

Added a new route in `routes.py` for the index page
that handles GET requests, retrieves query parameters
for `name`, `author`, and `read`, and executes SQL
queries to fetch and render books using the
`books.html` template.

Author: CalinL

samples/Pipfile.lock

@@ -0,0 +1,30 @@
+
+from flask import request, render_template, make_response
+
+from server.webapp import flaskapp, cursor
+from server.models import Book
+
+
+@flaskapp.route('/')
+def index():
+    name = request.args.get('name')
+    author = request.args.get('author')
+    read = bool(request.args.get('read'))
+
+    if name:
+        cursor.execute(
+            "SELECT * FROM books WHERE name LIKE '%" + name + "%'"
+        )
+        books = [Book(*row) for row in cursor]
+
+    elif author:
+        cursor.execute(
+            "SELECT * FROM books WHERE author LIKE '%" + author + "%'"
+        )
+        books = [Book(*row) for row in cursor]
+
+    else:
+        cursor.execute("SELECT name, author, read FROM books")
+        books = [Book(*row) for row in cursor]
+
+    return render_template('books.html', books=books)