Revert "added welcome message (#3975)"

This reverts commit 4eeb9e3.

Author: DonnieBLT

website/views/slack_handlers.py

@@ -238,28 +238,7 @@ def _handle_team_join(user_id, request):
                         ":small_blue_diamond: *Get Involved:*\n"
                         "• Check out the *#contribute* channel to find ways to get involved with OWASP projects and initiatives.\n"
                         "• Explore individual project channels, which are named *#project-name*, to dive into specific projects that interest you.\n"
-                        "• Join our chapter channels, named *#chapter-name*, to connect with local OWASP members in your area.\n"
-                        "• To start contributing, look for 'good first issues' tags or ask in project channels for beginner-friendly tasks.\n"
-                        "• Visit our bounties page at <https://blt.owasp.org/bounties> to find paid bug hunting opportunities! 💰\n\n"
-                        ":small_blue_diamond: *Google Summer of Code 2025:*\n"
-                        "• Join the *#gsoc* channel for GSoC program discussions and announcements.\n"
-                        "• Connect with project mentors in their respective project channels:\n"
-                        "  - *#project-blt*: Mentored by Donnie, Yash Pandey,Bishal Das, Ahmed ElSheikh,Patricia Waiyego,Sudhir\n"
-                        "  - *#project-juice-shop*: Mentored by Bjoern Kimminich, Shubham Palriwala, Jannik Hollenbach\n"
-                        "  - *#dsomm*: Mentored by Timo Pagel, Aryan Prasad (DevSecOps Maturity Model)\n"
-                        "  - *#project-owtf*: Mentored by Viyat Bhalodia, Abraham Aranguran\n"
-                        "  - *#project-nest*: Mentored by Arkadii Yakovets,Kateryna Golovanova ,Tamara Lazerka \n"
-                        "  - *#project-nettacker*: Mentored by Sam Stepanyan, Ali Razmjoo, Arkadii Yakovets\n"
-                        "  - *#project-cre*: Mentored by Spyros Gasteratos, Rob Van Der Veer ,Paola Gardenas\n"
-                        "  - *#project-pygoat*: Mentored by ardiansyah ,Rupak Biswas\n"
-                        "• View all GSoC project ideas at: <https://owasp.org/www-community/initiatives/gsoc/gsoc2025ideas>\n\n"
-                        ":small_blue_diamond: *OWASP Projects Overview:*\n"
-                        "• OWASP has 100+ active security projects across different maturity levels:\n"
-                        "  - Flagship Projects: Industry-leading security tools and resources\n"
-                        "  - Production Projects: Mature, established security projects\n"
-                        "  - Incubator Projects: Promising projects under active development\n"
-                        "  - Lab Projects: Innovative experimental initiatives\n"
-                        "• Use `/stats` command to see up-to-date project statistics\n\n"
+                        "• Join our chapter channels, named *#chapter-name*, to connect with local OWASP members in your area.\n\n"
                         ":small_blue_diamond: *Stay Updated:*\n"
                         "• Visit *#newsroom* for the latest updates and announcements.\n"
                         "• Follow *#external-activities* for news about OWASP's engagement with the wider security community.\n\n"