fix(a11y): solid color for secondary text (#148)

components/user/UserSignIn.vue

@@ -24,7 +24,7 @@ async function handleInput() {
     </div>
     <div>Mastodon Server Name</div>
     <div flex bg-gray:10 px2 py1 mxa rounded border="~ border" text-xl items-center>
-      <span op35 mr1 text-sm>https://</span>
+      <span text-secondary-light mr1 text-sm>https://</span>
       <input v-model="server" :placeholder="DEFAULT_SERVER" outline-none bg-transparent @input="handleInput">
     </div>
     <button btn-solid mt2>

components/user/UserSignInEntry.vue

@@ -1,6 +1,6 @@
 <template>
   <div p8 flex="~ col gap4">
-    <div text-sm op50>
+    <div text-sm text-secondary>
       Sign in to follow profiles or hashtags, favourite, share and reply to posts, or interact from your account on a different server.
     </div>
     <button class="btn-solid text-center" @click="openSigninDialog()">