Non-consecutive header warning

[wd60622]

Warnings from headers increasing in non-consecutive order

Here are the build warnings:

pymc-marketing/docs/source/notebooks/clv/pareto_nbd.ipynb:130006: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/clv/pareto_nbd.ipynb:130020: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_roas.ipynb:10005: WARNING: Non-consecutive header level increase; H1 to H3 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_roas.ipynb:10009: WARNING: Non-consecutive header level increase; H1 to H3 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_roas.ipynb:10015: WARNING: Non-consecutive header level increase; H1 to H3 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_roas.ipynb:10019: WARNING: Non-consecutive header level increase; H1 to H3 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_roas.ipynb:10029: WARNING: Non-consecutive header level increase; H1 to H3 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_roas.ipynb:10033: WARNING: Non-consecutive header level increase; H1 to H3 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_roas.ipynb:10039: WARNING: Non-consecutive header level increase; H1 to H3 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_tvp_example.ipynb:60002: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_tvp_example.ipynb:100002: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_tvp_example.ipynb:120002: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_tvp_example.ipynb:140002: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_tvp_example.ipynb:160002: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_tvp_example.ipynb:260002: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_tvp_example.ipynb:280002: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_tvp_example.ipynb:300002: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_tvp_example.ipynb:320002: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_tvp_example.ipynb:400002: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_tvp_example.ipynb:420002: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_tvp_example.ipynb:440002: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]
pymc-marketing/docs/source/notebooks/mmm/mmm_tvp_example.ipynb:470002: WARNING: Non-consecutive header level increase; H2 to H4 [myst.header]