Adds module for Pretalx Limited File Write module (CVE-2023-28458)

documentation/modules/exploit/linux/http/pretalx_rce_cve_2023_28458.md

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+The following is the recommended format for module documentation. But feel free to add more content/sections to this.
+One of the general ideas behind these documents is to help someone troubleshoot the module if it were to stop
+functioning in 5+ years, so giving links or specific examples can be VERY helpful.
+
+## Vulnerable Application
+
+Instructions to get the vulnerable application. If applicable, include links to the vulnerable install
+files, as well as instructions on installing/configuring the environment if it is different than a
+standard install. Much of this will come from the PR, and can be copy/pasted.
+
+## Verification Steps
+Example steps in this format (is also in the PR):
+
+1. Install the application
+1. Start msfconsole
+1. Do: `use [module path]`
+1. Do: `run`
+1. You should get a shell.
+
+## Options
+List each option and how to use it.
+
+### Option Name
+
+Talk about what it does, and how to use it appropriately. If the default value is likely to change, include the default value here.
+
+## Scenarios
+Specific demo of using the module that might be useful in a real world scenario.
+
+### Version and OS
+
+```
+code or console output
+```
+
+For example:
+
+To do this specific thing, here's how you do it:
+
+```
+msf > use module_name
+msf auxiliary(module_name) > set POWERLEVEL >9000
+msf auxiliary(module_name) > exploit
+```