Drop the vendor conference decks and a citation that no longer matches

The two PDFs are another company's slide decks, 12M of them, kept only so a
resources list could link to them. The CONCRETE entry had already had its
title rewritten, so it named a paper that does not exist under that name —
a citation that does not match the work it points at is not a citation.

docs/resources/README.md

@@ -336,7 +336,6 @@ Research papers and publications by the LuxFHE team sorted by date
 - Primary elements in cyclotomic fields with applications to power residue symbols, and more [[ePrint version](https://ia.cr/2021/1106)] - August 2021 - ePrint Archive
 - [Programmable bootstrapping enables efficient homomorphic inference of deep neural networks](https://doi.org/10.1007/978-3-030-78086-9_1) [[ePrint version](https://ia.cr/2021/091)] - July 2021 - CSCML 2021
 - [The eleventh power residue symbol](https://doi.org/10.1515/jmc-2020-0077) [[ePrint version](https://ia.cr/2019/870)] - January 2021 - Journal of Mathematical Cryptology
-- [CONCRETE: Torus operates on ciphertexts rapidly by extending TfhE](https://doi.org/10.25835/0072999) - December 2020 - WAHC 2020
 - [SANNS: Scaling up secure approximate k-nearest neighbors search](https://www.usenix.org/conference/usenixsecurity20/presentation/chen-hao) - August 2020 - USENIX 2020
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@@ -385,7 +384,6 @@ Talks, posters, and presentations by LuxFHE team sorted by date
 - [Threshold key generation and decryption for FHEVM Chains](https://www.youtube.com/watch?v=upKFexrGoUE) - July 2024 - EthCC 7
 - [Decentralized AI: Safeguarding privacy with FHE ](https://www.youtube.com/watch?v=a6dQQSaEtJM) - July 2024 - EthCC 7
 - [FHE on Ethereum](https://www.youtube.com/watch?v=WngC5cvV_fc) July 2024 - EthCC 7
-- [Privacy-preserving machine learning](data/AgoraCloudBruxelles2024.pdf) - June 2024 - Agora Cloud event 2024 (organized by European Commission)
 - [Privacy-preserving ML with Fully Homomorphic Encryption (Video)](https://www.youtube.com/watch?v=g1Zlu63TP0Y) - May 2024 - Google TechTalks
 
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