Add a gitea-release step to the Drone pipeline that uploads everything
in build/libs/*.jar to a Gitea Release named after the pushed tag,
authenticating with a gitea_token secret. The step is guarded with
when.event tag, and tag was added to the pipeline trigger so the build
itself runs for tag events. Document the one-time token / secret setup
and the tag workflow in the README.
Starting with 26.1 Mojang ships Minecraft unobfuscated, and Yarn /
Intermediary are no longer published past 1.21.11. Loom does not need
a mappings dependency in that mode: the Mojang-named source compiles
directly. Remove the mappings line, drop the yarn_mappings property,
revert the client entrypoint to Mojang names (Minecraft, Component,
ChatFormatting, gui.getChat(), getUser().getName()), and rewrite the
README note so it stops claiming Mojang mappings via Loom.
