Update quantecon.org for new structure

[mmcky]

• deploy updated quantecon.org frontpage

• migrate current lectures.quantecon.org to quantecon.org redesigned front page

  a. for the new python button it should direct to the landing page in [python.quantecon.org] Create new landing page for Split Projects #961 (above)

[DrDrij]

• deploy updated quantecon.org frontpage
• migrate current lectures.quantecon.org to quantecon.org redesigned front page

• The new python button should direct to the landing page in [python.quantecon.org] Create new landing page for Split Projects #961 (above)

In concept stage. Will update link once new python landing page deployed.

[mmcky]

@DrDrij I will close this issue as the python button redirect will be part of the deployment issue.