Make instance logo customisable (#3829)

src/client/app/admin/views/instance.vue

@@ -6,6 +6,7 @@
 			<ui-input :value="host" readonly>{{ $t('host') }}</ui-input>
 			<ui-input v-model="name">{{ $t('instance-name') }}</ui-input>
 			<ui-textarea v-model="description">{{ $t('instance-description') }}</ui-textarea>
+			<ui-input v-model="logoUrl"><i slot="icon"><fa icon="link"/></i>{{ $t('logo-url') }}</ui-input>
 			<ui-input v-model="bannerUrl"><i slot="icon"><fa icon="link"/></i>{{ $t('banner-url') }}</ui-input>
 			<ui-input v-model="errorImageUrl"><i slot="icon"><fa icon="link"/></i>{{ $t('error-image-url') }}</ui-input>
 			<ui-input v-model="languages"><i slot="icon"><fa icon="language"/></i>{{ $t('languages') }}<span slot="desc">{{ $t('languages-desc') }}</span></ui-input>
@@ -149,6 +150,7 @@ export default Vue.extend({
 			maintainerEmail: null,
 			disableRegistration: false,
 			disableLocalTimeline: false,
+			logoUrl: null,
 			bannerUrl: null,
 			errorImageUrl: null,
 			name: null,
@@ -196,6 +198,7 @@ export default Vue.extend({
 			this.maintainerEmail = meta.maintainer.email;
 			this.disableRegistration = meta.disableRegistration;
 			this.disableLocalTimeline = meta.disableLocalTimeline;
+			this.logoUrl = meta.logoUrl;
 			this.bannerUrl = meta.bannerUrl;
 			this.errorImageUrl = meta.errorImageUrl;
 			this.name = meta.name;
@@ -253,6 +256,7 @@ export default Vue.extend({
 				maintainerEmail: this.maintainerEmail,
 				disableRegistration: this.disableRegistration,
 				disableLocalTimeline: this.disableLocalTimeline,
+				logoUrl: this.logoUrl,
 				bannerUrl: this.bannerUrl,
 				errorImageUrl: this.errorImageUrl,
 				name: this.name,

src/client/app/desktop/views/pages/welcome.vue

@@ -35,7 +35,7 @@
 						<span class="signin" @click="signin">{{ $t('signin') }}</span>
 					</p>
 
-					<img src="/assets/ai.png" alt="" title="藍" class="char">
+					<img :src="meta.logoUrl || '/assets/ai.png'" alt="" title="藍" class="char">
 				</div>
 			</div>