chore: Removed unneeded install line

[dandawg]

What this PR does / why we need it:

This PR removes the command pip install Pygments -q (and a supporting comment) from the quickstart.ipynb notebook. This install command is not needed because Pygments is a feast dependency that is installed with feast. Removing the extra install line simplifies the notebook and makes it easier to get started quickly, as it makes the cell run faster.

Which issue(s) this PR fixes:

Misc

To test that the notebook still works you can:

1. Create a new venv and install jupyter (you need this to run the notebook):

cd examples/quickstart
python -m venv temp-venv
pip install jupyter

2. Run the quickstart.ipynb from this PR (with the Pygments import statement removed). It should run successfully.

jupyter execute quickstart.ipynb

Note that the notebook itself installs feast latest. You can verify that pygments is an explicit dependency of feast with:

% pip show Pygments | grep Required-by

# Output
Required-by: feast, ipython, jupyter-console, nbconvert