refactor(from): use h1 and p for selectors, not mdc-classes

We don't use MDC typographic styles anymore
and these classes were misleading

Author: Kiarokh

src/components/form/form.scss

@@ -160,7 +160,7 @@ limel-code-editor {
     width: 100%;
 }
 
-.mdc-typography--headline1 {
+h1 {
     position: relative;
     margin-top: 0;
     margin-bottom: 0;
@@ -175,7 +175,7 @@ limel-code-editor {
     font-weight: 500;
 }
 
-.mdc-typography--body1 {
+p {
     margin-top: 0;
     margin-bottom: 0.75rem;
     font-size: var(--limel-theme-default-font-size);
@@ -197,18 +197,18 @@ h1 + .limel-form-array-item--simple {
         left: calc(var(--form-column-gap, 1rem) * -0.5);
     }
 
-    .mdc-typography--headline1,
-    .mdc-typography--body1 {
+    h1,
+    p {
         color: rgb(var(--contrast-1400), 0.8);
     }
 
-    .mdc-typography--headline1 {
+    h1 {
         --limel-form-h1-font-size: 1.476rem;
         font-weight: 800;
     }
 
     .form-group {
-        .mdc-typography--headline1 {
+        h1 {
             --limel-form-h1-font-size: 1.383rem;
             font-weight: 700;
 
@@ -234,7 +234,7 @@ h1 + .limel-form-array-item--simple {
         }
 
         .form-group {
-            .mdc-typography--headline1 {
+            h1 {
                 --limel-form-h1-font-size: 1.296rem;
                 font-weight: 600;
 
@@ -244,7 +244,7 @@ h1 + .limel-form-array-item--simple {
             }
 
             .form-group {
-                .mdc-typography--headline1 {
+                h1 {
                     --limel-form-h1-font-size: 1.215rem;
 
                     &:before {
@@ -253,7 +253,7 @@ h1 + .limel-form-array-item--simple {
                 }
             }
             .form-group {
-                .mdc-typography--headline1 {
+                h1 {
                     --limel-form-h1-font-size: 1.138rem;
 
                     &:before {
@@ -262,7 +262,7 @@ h1 + .limel-form-array-item--simple {
                 }
 
                 .form-group {
-                    .mdc-typography--headline1 {
+                    h1 {
                         --limel-form-h1-font-size: 1.067rem;
 
                         &:before {