New LinkStack release (version 4.8.3)

Security + Feature Update

### New additions: **Minor changes:** - Added new social icons https://github.com/LinkStackOrg/LinkStack/pull/811 https://github.com/LinkStackOrg/LinkStack/commit/03e8fdc79aa033f8543e6020f678d023e548b5af - Backend refactoring - [Critical security fixes](#1) - Minor bugfixes - Changed Twitter to X @MattDevTec - [Improved updater](#2)
# New Modular Blocks System This update introduces a modular blocks system for LinkStack, replacing the previous hard-coded blocks. You can now add community-made blocks by placing them in the new "blocks" directory, similar to themes. Blocks are self-contained add-ons that enhance your LinkStack instance, offering new features like buttons, embedded videos, and dynamic feeds. Each block is fully integrated and accessible via the blocks dropdown menu. If you are a developer and want to make your own block checkout the documentation for the block system and the example block. [Block System Documentation](https://github.com/LinkStackOrg/linkstack-blocks/wiki) [Example Block](https://github.com/LinkStackOrg/example-block) --- ### Critical security fixes A severe security vulnerability has been addressed, which previously allowed bad actors to upload malicious files. Special thanks to @aponie for identifying and assisting in resolving this issue. --- ### Improved updater - Resolved issues where updates could incorrectly display a successful update message when no changes were made. - Fixed a timeout error that occurred during updates. - Improved error handling. - Removed dependency: [codedge/laravel-selfupdater](https://github.com/codedge/laravel-selfupdater).