= Make `\Include` headers show on table of contents work for cirosantilli.com
One of the <4/the table of contents shows across different files via \Include>[key advances of the previous update] was to show include headers on the table of contents.
This was to allow splitting source files freely.
While that goal was in principle achieved in that commit, when I went ahead to split the huge index of cirosantilli.com into multiple files, I notice several bugs that took a week to fix.
After all of these were solved, I finally managed to split the https://github.com/cirosantilli/cirosantilli.github.io/blob/84c8a6e7fdbe252041accfb7a06d9b7462287131/README.ciro[README] at: https://github.com/cirosantilli/cirosantilli.github.io/commit/84c8a6e7fdbe252041accfb7a06d9b7462287131 and keep the previous desired output. You can now see that the README contains just:
``
\Include[ciro-santilli]
\Include[science]
\Include[mathematics]
\Include[technology]
\Include[art]
``
This split led to a small positive modification of the output as follows. Previously, a section such as "Quantum Electrodynamics" would have been present in the monolithic README.ciro as:
``
= Quantum electrodynamics
``
If you visited https://cirosantilli.com/quantum-electrodynamics[], you would see see a link to the "nosplit" version, which would link you back to https://cirosantilli.com\#quantum-electrodynamics[], but that is not great, since this is was a humongous page with all of the README.ciro, and took long to display.
After the split, `= Quantum electrodynamics` is present under `science.ciro`, and the nosplit version is the more manageable https://cirosantilli.com/science\#quantum-electrodynamics[].
The key changes that were missing for that to happen were:
* <link to an image or video in another file that has an \x on title from another file>