Adds 39C3 entry for XFEL; capitalizes `38C3` and `39C3` in headlines #41

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ViMaSter wants to merge 5 commits from 39c3-xfel into main

Author	SHA1	Message	Date
ViMaSter	7ac4c3bef3	docs: Updates links to match https://www.xfel.eu/besucherinnen/index_ger.html All checks were successful / build (pull_request) Successful in 27s Details	2025-11-17 09:52:07 +01:00
ViMaSter	6ccf3eb397	docs: Updates links to match https://www.xfel.eu/visitors/index_eng.html All checks were successful / build (pull_request) Successful in 29s Details	2025-11-17 09:51:47 +01:00
Vincent Mahnke	3a887f6c4b	fix: Resolves `date` typo All checks were successful / build (pull_request) Successful in 27s Details	2025-11-12 18:41:08 +01:00
Vincent Mahnke	5e9c78fac3	fix: Capitalizes `C3` in XFEL headlines Some checks failed / build (pull_request) Failing after 15s Details	2025-11-12 17:04:04 +01:00
Vincent Mahnke	d56b81a446	feat: Adds 39c3 European XFEL	2025-11-12 17:01:54 +01:00

Adds 39C3 entry for XFEL; capitalizes 38C3 and 39C3 in headlines #41