Temporary: move static files into content

During migration, while we launch Redocly with -d content, the static
files need to be in content. Eventually, when we stop using -d, we need
to move the files again.

Previously:
/assets : static assets used by templates
/img : images used in documentation (mostly)

Now:
/content/static : static assets used by templates
/img : images used in documentation (mostly)

Eventually:
/static : static assets used by templates
/docs/img : images used in documentation

content/static/js/tutorials/enable-no-freeze.js

@@ -0,0 +1,59 @@
+// 1. Generate
+// 2. Connect
+// The code for these steps is handled by interactive-tutorial.js
+$(document).ready(() => {
+
+  // 3. Send AccountSet --------------------------------------------------------
+  $("#send-accountset").click( async (event) => {
+    const block = $(event.target).closest(".interactive-block")
+    const address = get_address(event)
+    if (!address) {return}
+
+    try {
+      await generic_full_send(event, {
+        "TransactionType": "AccountSet",
+        "Account": address,
+        "SetFlag": xrpl.AccountSetAsfFlags.asfNoFreeze
+      })
+      complete_step("Send AccountSet")
+    } catch(err) {
+      block.find(".loader").hide()
+      show_error(block, err)
+    }
+  })
+
+  // 4. Wait for Validation: handled by interactive-tutorial.js and by the
+  // generic full send in the previous step. -----------------------------------
+
+  // 5. Confirm Account Settings -----------------------------------------------
+  $("#confirm-settings").click( async (event) => {
+    const block = $(event.target).closest(".interactive-block")
+    const address = get_address(event)
+    if (!address) {return}
+
+    block.find(".output-area").html("")
+    block.find(".loader").show()
+    const account_info = await api.request({
+        "command": "account_info",
+        "account": address,
+        "ledger_index": "validated"
+    })
+    console.log(account_info)
+    const flags = xrpl.parseAccountRootFlags(account_info.result.account_data.Flags)
+    block.find(".loader").hide()
+
+    block.find(".output-area").append(
+        `<p>Got settings for address ${address}:</p>
+        <pre><code>${pretty_print(flags)}</code></pre>`)
+    if (flags.lsfNoFreeze) {
+      block.find(".output-area").append(`<p><i class="fa fa-check-circle"></i>
+          No Freeze flag is enabled.</p>`)
+    } else {
+      block.find(".output-area").append(`<p><i class="fa fa-times-circle"></i>
+          No Freeze flag is DISABLED.</p>`)
+    }
+
+    complete_step("Confirm Settings")
+  })
+
+})