Convert historic pages to new gallery shortcode

content/en/39c3/flora/index.md

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 The Rote Flora (German for "Red Flora", "Flora" derived from "flower") is a cultural and political center in the district of Sternschanze in Hamburg. The Rote Flora stands for (post-)autonomous forms of politics, is used across different movements and is known nationwide. Since November 1989, the Rote Flora has been managing to retain its squatted status and non-commercial character. On our tour through the building, we will tell you about the history of the project and show you the many different ways in which the building can be used.
 
-![View of the outisde of the Rote Flora](Flora_aussen.jpeg "CC BY-SA 4.0 Frank Schwichtenberg")
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+{{< gallery-image src="Flora_aussen.jpeg" alt="View of the outisde of the Rote Flora" credit="CC BY-SA 4.0 Frank Schwichtenberg" >}}
+{{< /gallery >}}
 Source:
 [Source file on Wikimedia Commons](https://commons.wikimedia.org/wiki/File:G-20_-_Hamburg_Schulterblatt_Rote_Flora_06.jpg)
 
 [Creative Commons License CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)
 
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 ## Details
 * Tours: 
     * ~~Day 2 (28 December) **10:30** German~~ fully booked