Removed streamlit and inflect

We are using bokeh instead of streamlit, so this gets rid of any dependence on streamlit as discussed in #31

I also took the chance to get rid of inflect, which we are not currently using (it was used in the streamlit example).

code/streamlit_example.py

-# Michiel's minimal example of a streamlit browser-based GUI
-# run using:
-# streamlit run <script name>
-
-import streamlit as st
-import numpy as np
-import string
-import matplotlib.pyplot as plt
-x = np.linspace(-1, 1, 101)
-model = st.sidebar.selectbox('function to plot', ['polynomial', 'sinusoidal'])
-placholder = st.empty()
-if model == 'polynomial':
-    degree = st.sidebar.slider("polynomial degree", 1, 10)
-    vars = list(string.ascii_lowercase[:degree])
-    terms = []
-    y = 0
-    for idx, var in enumerate(vars):
-        if idx == 0:
-            terms.append(var)
-        elif idx == 1:
-            terms.append(f"{var} x")
-        else:
-            terms.append(f"{var} x^{idx}")
-        value = st.slider(var, -10., 10., 1. if idx == len(vars) - 1 else 0.)
-        y += value * x ** idx
-    equation = " + ".join(terms)
-elif model == 'sinusoidal':
-    equation = "A sin(\omega x + \phi)"
-    A = st.slider("Amplitude (A)", -10., 10., 1.)
-    omega = st.slider("Frequency (omega)", -10., 10., np.pi)
-    phi = st.slider("phase (phi)", -10., 10., 0.)
-    y = A * np.sin(omega * x + phi)
-placholder.write(f"${equation}$")
-fig = plt.figure()
-plt.plot(x, y)
-st.write(fig)
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