add metadata for two authors; remove two duplicate commentaries

[andresmessina-SDG]

Summary

Two small data fixes I came across while building an offline SQLite pack from this
database for Scriptura (a native GNOME Bible app — the "Voices of the Church"
pane is built on your data, with your kind permission a while back):

1. Add the missing metadata.toml for two author folders.
2. Remove two exact duplicate commentaries.

python compile_data.py dryrun passes with these changes.

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1. Missing metadata.toml

Two author folders had no metadata.toml, so they fall back to no default_year
and no father_category. Added both, with sources:

Didymus of Alexandria → this is Didymus the Blind (c. 313 – 398), head of the
Alexandrian catechetical school; his one entry here (on Wisdom 8:8) is cited to
PG 39, which is his volume.

default_year=398
wiki='https://en.wikipedia.org/wiki/Didymus_the_Blind'
father_category='Eastern & Byzantine Theology'

Sources: Catholic Encyclopedia,
Britannica.

Cerealis of Castellum Ripense → Latin North-African bishop, author of the
Libellus contra Maximinum Arianum; took part in the 484 Council of Carthage under
Huneric, treatise dated 485 (his entry here, on Wisdom 18:15, is from that work).
No English Wikipedia page, so I used the McClintock & Strong entry, consistent with
how other obscure figures in this repo are linked.

default_year=485
wiki='https://www.biblicalcyclopedia.com/C/cerealis.html'
father_category='Western & Medieval Theology'

Sources: McClintock & Strong, Biblical Cyclopedia,
Contra Maximinum Arianum full text [0485].

(Feel free to adjust either default_year/father_category if you prefer a
different convention — happy to amend.)

2. Duplicate commentaries removed

Two files each contained the same commentary twice, verbatim:

• Cyril of Alexandria/John 1_46.toml — the "Nathanael readily agrees…" quote appeared twice.
• Jerome/Genesis 10_10.toml — the "(Verse 10.) And it was, he said, the head of his kingdom…" quote appeared twice.

Removed the second copy in each; one copy remains.

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Thanks again for maintaining this — it's a joy to build on.