docs: Use MyST and sphinx-external-toc

[mikemckiernan]

• Revise headings in some notebooks so that
  second-level headings (Overview) do not appear
  in the TOC.

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GitHub pull request #251 of commit bd351afdc828f5995947ab5920ecaf01251a205c, no merge conflicts.
Running as SYSTEM
Setting status of bd351afdc828f5995947ab5920ecaf01251a205c to PENDING with url https://10.20.13.93:8080/job/merlin_merlin/53/console and message: 'Pending'
Using context: Jenkins
Building on master in workspace /var/jenkins_home/workspace/merlin_merlin
using credential systems-login
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://github.com/NVIDIA-Merlin/Merlin # timeout=10
Fetching upstream changes from https://github.com/NVIDIA-Merlin/Merlin
 > git --version # timeout=10
using GIT_ASKPASS to set credentials login for merlin-systems
 > git fetch --tags --force --progress -- https://github.com/NVIDIA-Merlin/Merlin +refs/pull/251/*:refs/remotes/origin/pr/251/* # timeout=10
 > git rev-parse bd351afdc828f5995947ab5920ecaf01251a205c^{commit} # timeout=10
Checking out Revision bd351afdc828f5995947ab5920ecaf01251a205c (detached)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f bd351afdc828f5995947ab5920ecaf01251a205c # timeout=10
Commit message: "docs: Use MyST and sphinx-external-toc"
 > git rev-list --no-walk 80ae7e79d80a714e344f34e71bf4a900f144d88e # timeout=10
[merlin_merlin] $ /bin/bash /tmp/jenkins771258200040721822.sh
============================= test session starts ==============================
platform linux -- Python 3.8.10, pytest-7.1.1, pluggy-1.0.0
rootdir: /var/jenkins_home/workspace/merlin_merlin/merlin
plugins: xdist-2.5.0, forked-1.4.0, cov-3.0.0
collected 1 item
tests/unit/test_version.py .                                             [100%]
============================== 1 passed in 0.01s ===============================

Performing Post build task...

Match found for : : True

Logical operation result is TRUE

Running script  : #!/bin/bash

cd /var/jenkins_home/

CUDA_VISIBLE_DEVICES=1 python test_res_push.py "https://github.com/gitapi/repos/NVIDIA-Merlin/Merlin/issues/$ghprbPullId/comments" "/var/jenkins_home/jobs/$JOB_NAME/builds/$BUILD_NUMBER/log"

[merlin_merlin] $ /bin/bash /tmp/jenkins1291080124308544736.sh

[github-actions]

Documentation preview

https://nvidia-merlin.github.io/Merlin/review/pr-251

[EvenOldridge]

This looks good. I'm wondering if the introduction isn't a better starting point than what's currently in the home link? But a great starting point.

[mikemckiernan]

This looks good. I'm wondering if the introduction isn't a better starting point than what's currently in the home link? But a great starting point.

The Intro--the README--is definitely more informative. I'm open to experimenting, but for the moment, my inclination is that a spare initial page might be OK because A) the navigation has a temptingly named "Introduction" item and B) the spare page definitely won't overwhelm readers.