Update to version 3.0.21

Bump pkgver and sha256sums for devin-desktop 3.0.21. Drop stale
appdata/zsh mv lines from build() — no longer present in the deb.
Update updater to use dynamic deb_path from the Packages index,
remove .SRCINFO auto-update (now handled manually), reset pkgrel=1
on each bump, and switch build hint to paru -Bi. Add pkg/ to cleanup.

Generated with [Devin](https://cli.devin.ai/docs)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

PKGBUILD

@@ -1,7 +1,7 @@
 # Maintainer: Chris Watson <cawatson1993@gmail.com>
 
 pkgname=devin-desktop
-pkgver=2.3.15
+pkgver=3.0.21
 pkgrel=1
 pkgdesc='Devin - the AI software engineer IDE'
 arch=('x86_64')
@@ -33,15 +33,12 @@ source=(
     "devin-desktop-${pkgver}.deb::https://windsurf-stable.codeiumdata.com/wVxQEIWkwPUEAGf3/apt/pool/main/d/devin-desktop/Devin-linux-x64-${pkgver}.deb"
     'code.sh::https://gitlab.archlinux.org/archlinux/packaging/packages/code/-/raw/main/code.sh'
 )
-sha256sums=('bd740d4872aed1d56303e4d4342ec41f634fcc82bb1c12cd6c3e29546a0a13e6'
-            'bd740d4872aed1d56303e4d4342ec41f634fcc82bb1c12cd6c3e29546a0a13e6')
+sha256sums=('909fd19e4f7e7f3bee5f213607a6c302d50345f3c1d96090f1bb3ae19b1b8ee4'
+            '5da1525b5fe804b9192c05e1cbf8d751d852e3717fb2787c7ffe98fd5d93e8c1')
 noextract=("devin-desktop-${pkgver}.deb")
 
 build() {
 	bsdtar -xOf "${srcdir}/devin-desktop-${pkgver}.deb" data.tar.xz | tar -xJf -
-	# Fix paths
-	mv usr/share/{appdata,metainfo}
-	mv usr/share/zsh/{vendor-completions,site-functions}
 	# Launcher
 	_app=/usr/share/devin-desktop/resources/app
 	sed -e 's|code-flags|devin-desktop-flags|' \