Fix deprecated sns.factorplot, replace with sns.catplot

[KayotPoziloy]

What

Replaces the deprecated sns.factorplot() call with sns.catplot() in
assignment02_analyzing_cardiovascular_desease_data.ipynb.

Why

sns.factorplot() has been deprecated since seaborn 0.9 and was fully
removed in later seaborn releases (aliased to catplot() before removal).
Running the notebook with a modern seaborn version raises an
AttributeError: module 'seaborn' has no attribute 'factorplot', which
breaks the assignment for anyone using an up-to-date environment.

Changes

• Replaced sns.factorplot(x='variable', y='count', hue='value', data=df_uniques, kind='bar', size=12) with the modern sns.catplot()
  equivalent.
• Replaced the deprecated size parameter with height.
• Added g.set_xticklabels(rotation=45, ha='right') so that category
  labels on the x-axis don't overlap, since the longer variable names
  no longer fit on one line.