Added default index page, default startPage, removed iframe (#250)

* Removed iframe, added default index page, made startPage optional parameter

* Renamed class for landing content

* Added paddings for message in index page, removed iframe link from index

* Renamed landing to greeting

* rm extra margins, upd svg

Co-authored-by: Peter Savchenko <specc.dev@gmail.com>

src/frontend/styles/components/greeting.pcss

@@ -0,0 +1,25 @@
+.greeting-body {
+  display: flex;
+  flex-direction: column;
+  width: 100%;
+  height: 100%;
+}
+
+.greeting-content {
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+  margin: auto;
+
+  & > svg {
+    width: 62px;
+    height: 71px;
+  }
+
+  &__message {
+    margin: 0;
+    padding: 26px 0 26px 0;
+    font-weight: 500;
+  }
+}

src/frontend/styles/components/landing.pcss

@@ -1,30 +0,0 @@
-/**
- * Index page landing iframe
- */
-.landing-body {
-  display: flex;
-  flex-direction: column;
-  width: 100%;
-  height: 100%;
-}
-
-.landing-loader {
-  position: absolute;
-  left: 50%;
-  top: 50%;
-  z-index: -1;
-  transform: translate(-50%, -50%);
-
-  & > svg {
-    width: 80px;
-    height: 80px;
-  }
-}
-
-.landing-frame {
-  width: 100%;
-  height: 100%;
-  opacity: 0;
-  transition: opacity 500ms ease;
-  will-change: opacity;
-}

src/frontend/styles/main.pcss

@@ -6,7 +6,7 @@
 @import './components/header.pcss';
 @import './components/writing.pcss';
 @import './components/page.pcss';
-@import './components/landing.pcss';
+@import './components/greeting.pcss';
 @import './components/auth.pcss';
 @import './components/error.pcss';
 @import './components/button.pcss';