[execution] Current Sphinx execution warnings

[mmcky]

• WARNING: Execution Failed: repos-collab/lecture-python.myst/lectures/ifp.md
• WARNING: Execution Failed: repos-collab/lecture-python.myst/lectures/optgrowth_fast.md
• WARNING: Execution Failed: /repos-collab/lecture-python.myst/lectures/markov_perf.md
• WARNING: Execution Failed: /repos-collab/lecture-python.myst/lectures/cake_eating_numerical.md
• WARNING: Execution Failed: /repos-collab/lecture-python.myst/lectures/egm_policy_iter.md
• WARNING: Execution Failed: repos-collab/lecture-python.myst/lectures/coleman_policy_iter.md
• WARNING: Execution Failed: /repos-collab/lecture-python.myst/lectures/optgrowth.md

[mmcky]

These primarily relate to literalinclude not being supported in jupyter-book

#10

[mmcky]

PR #16 fixes this.