Remove Sinensis Scan (#8025)

Sinensis Scan merged with Cerise Scan as reported in #7424, and Sinensis's website is dead/offline.

src/pt/sinensis/build.gradle

@@ -1,9 +0,0 @@
-ext {
-    extName = 'Sinensis Scan'
-    extClass = '.SinensisScan'
-    themePkg = 'peachscan'
-    baseUrl = 'https://sinensis.leitorweb.com'
-    overrideVersionCode = 39
-}
-
-apply from: "$rootDir/common.gradle"

src/pt/sinensis/src/eu/kanade/tachiyomi/extension/pt/sinensis/SinensisScan.kt

@@ -1,14 +0,0 @@
-package eu.kanade.tachiyomi.extension.pt.sinensis
-
-import eu.kanade.tachiyomi.multisrc.peachscan.PeachScan
-import eu.kanade.tachiyomi.network.interceptor.rateLimit
-
-class SinensisScan : PeachScan(
-    "Sinensis Scan",
-    "https://sinensis.leitorweb.com",
-    "pt-BR",
-) {
-    override val client = super.client.newBuilder()
-        .rateLimit(3)
-        .build()
-}