rename web/ to admin/, along with the web-named build and cli identifiers

docs/how-to/verify-a-release.md

@@ -275,9 +275,9 @@ git clone https://git.mial.net/mokhtar/nxdns
 cd nxdns
 git checkout "v$VERSION"
 git verify-tag "v$VERSION"
-(cd web && npm ci && npm run build)
+(cd admin && npm ci && npm run build)
 zig build dist -Dversion-string="$VERSION" -Dgit-commit="$(git rev-parse HEAD)" \
-  -Dweb-dist=web/dist -Doptimize=ReleaseSafe
+  -Dadmin-dist=admin/dist -Doptimize=ReleaseSafe
 sha256sum zig-out/dist/nxdns-"$VERSION"-*.tar.gz
 ```