Update about.md to include professional background details

Expanded the "About" section with information about professional experience, day-to-day work, and technical interests. Adjusted contact details and phrasing for clarity and added instructions for sending encrypted mails.

about.md

@@ -5,12 +5,24 @@ layout: page
 comments: false
 ---
 
+I'm interested in gaming and software engineering, especially backend techniques using PHP as my main programming
+language. I am familiar with [Laravel](https://laravel.com) as framework.
+
+I host a lot of services on my own or friends' servers. A bunch of your own simple web servers running Apache or NGINX,
+a self-hosted [Forgejo](https://forgejo.org) instance and some other simple services.
+
+In my day-to-day work, I work as a senior software engineer for a Cologne-based e-mobility company. After working as a
+People Lead for about a year, I gave up that role and went back to being a full-time software engineer. The current
+focus is on billing processes for charging transactions and contract customers. This includes everything from the
+calculation of individual positions to invoicing and the handling of taxes. For more information mail me.
+
 If you have a question about me or else, just send me a mail.
 
-You can [report](mailto:hello@elyday.dev) if there is an broken link(s) or something else.
+You can [report](mailto:hello@elyday.dev) if there is any broken link(s) or something else.
 
-**may u needs ✨**
+**contacts 📭**
 
-- [hello@elyday.dev](mailto:hello@elyday.dev)
+- [hello@elyday.dev](mailto:hello@elyday.dev) (use [age](https://github.com/FiloSottile/age)
+  for [encrypted](https://git.techturtle.de/elyday#send-an-encrypted-mail) mails)
 - [github.com/elyday](https://github.com/elyday)
 - [git.techturtle.de/elyday](https://git.techturtle.de/elyday)