Improve profile readme rendering (#25988)

- Tell the renderer to use the `document` mode, so it's consistent with
other renderers.
- Use the same padding as `.file-view.markup`, so it's consistent with
other containers that contain markup rendering.
- Resolves https://codeberg.org/forgejo/forgejo/issues/833

Co-authored-by: Gusted <postmaster@gusted.xyz>
Conflicts:
	routers/web/user/profile.go
	inserted Metas:   map[string]string{"mode": "document"}, where
	it was missing

routers/web/user/profile.go

@@ -115,6 +115,7 @@ func Profile(ctx *context.Context) {
 			profileContent, err := markdown.RenderString(&markup.RenderContext{
 				Ctx:     ctx,
 				GitRepo: gitRepo,
+				Metas:   map[string]string{"mode": "document"},
 			}, bytes)
 			if err != nil {
 				ctx.ServerError("RenderString", err)

web_src/css/user.css

@@ -122,7 +122,7 @@
 }
 
 #readme_profile {
-  padding: 10px;
+  padding: 1em 2em;
   border-radius: 0.28571429rem;
   background: var(--color-card);
   border: 1px solid var(--color-secondary);