Remove custom extension readme/changelog URLs

These were barely used/maintained, so just killing them.
Changelog menu item still exists to take you to the relevant git history.

app/src/main/java/eu/kanade/tachiyomi/extension/api/ExtensionGithubApi.kt

@@ -126,8 +126,6 @@ internal class ExtensionGithubApi {
                     libVersion = it.extractLibVersion(),
                     lang = it.lang,
                     isNsfw = it.nsfw == 1,
-                    hasReadme = it.hasReadme == 1,
-                    hasChangelog = it.hasChangelog == 1,
                     sources = it.sources?.map(extensionSourceMapper).orEmpty(),
                     apkName = it.apk,
                     iconUrl = "${getUrlPrefix()}icon/${it.pkg}.png",
@@ -164,8 +162,6 @@ private data class ExtensionJsonObject(
     val code: Long,
     val version: String,
     val nsfw: Int,
-    val hasReadme: Int = 0,
-    val hasChangelog: Int = 0,
     val sources: List<ExtensionSourceJsonObject>?,
 )
 

app/src/main/java/eu/kanade/tachiyomi/extension/model/Extension.kt

@@ -13,8 +13,6 @@ sealed class Extension {
     abstract val libVersion: Double
     abstract val lang: String?
     abstract val isNsfw: Boolean
-    abstract val hasReadme: Boolean
-    abstract val hasChangelog: Boolean
 
     data class Installed(
         override val name: String,
@@ -24,8 +22,6 @@ sealed class Extension {
         override val libVersion: Double,
         override val lang: String,
         override val isNsfw: Boolean,
-        override val hasReadme: Boolean,
-        override val hasChangelog: Boolean,
         val pkgFactory: String?,
         val sources: List<Source>,
         val icon: Drawable?,
@@ -43,8 +39,6 @@ sealed class Extension {
         override val libVersion: Double,
         override val lang: String,
         override val isNsfw: Boolean,
-        override val hasReadme: Boolean,
-        override val hasChangelog: Boolean,
         val sources: List<Source>,
         val apkName: String,
         val iconUrl: String,
@@ -75,7 +69,5 @@ sealed class Extension {
         val signatureHash: String,
         override val lang: String? = null,
         override val isNsfw: Boolean = false,
-        override val hasReadme: Boolean = false,
-        override val hasChangelog: Boolean = false,
     ) : Extension()
 }

app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionLoader.kt

@@ -331,8 +331,6 @@ internal object ExtensionLoader {
             libVersion = libVersion,
             lang = lang,
             isNsfw = isNsfw,
-            hasReadme = hasReadme,
-            hasChangelog = hasChangelog,
             sources = sources,
             pkgFactory = appInfo.metaData.getString(METADATA_SOURCE_FACTORY),
             isUnofficial = !isOfficiallySigned(signatures),