Emulate current DNS configuration

Note: The emulation is not perfect. Specifically, the current configuration uses TXT records with different TTLs, which is both unsupported and not recommended. See octodns/octodns#406. The exact DNS updates are pasted below for future reference.

INFO  Plan
********************************************************************************
* tjuav.org.
********************************************************************************
* cloudflare (CloudflareProvider)
*   Update
*     <TxtRecord TXT 3600, tjuav.org., ['google-site-verification=kDVIO-3JicgMGQ1CrZz3C8usMiZNyZnL1OyUmtMJrCE', 'v=spf1 include:_spf.mx.cloudflare.net include:_spf.google.com ~all']> ->
*     <TxtRecord TXT 3600, tjuav.org., ['google-site-verification=kDVIO-3JicgMGQ1CrZz3C8usMiZNyZnL1OyUmtMJrCE', 'v=spf1 include:_spf.mx.cloudflare.net include:_spf.google.com ~all'], {'cloudflare': {'auto-ttl': True}}> (config)
*   Summary: Creates=0, Updates=1, Deletes=0, Existing Records=7
********************************************************************************

tjuav.org.yaml

@@ -1 +1,70 @@
----
+'':
+  # GitHub Pages Configuration
+  - type: A
+    values:
+      - 185.199.108.153
+      - 185.199.109.153
+      - 185.199.110.153
+      - 185.199.111.153
+    octodns:
+      cloudflare:
+        proxied: true
+        auto-ttl: true
+
+  # Cloudflare Mail Configuration
+  - type: MX
+    values:
+      - exchange: route3.mx.cloudflare.net.
+        preference: 20
+      - exchange: route2.mx.cloudflare.net.
+        preference: 82
+      - exchange: route1.mx.cloudflare.net.
+        preference: 92
+    octodns:
+      cloudflare:
+        auto-ttl: true
+
+  - type: TXT
+    values:
+      # Mail SPF Configuration
+      - 'v=spf1 include:_spf.mx.cloudflare.net include:_spf.google.com ~all'
+      # Google Search Console Verification
+      - 'google-site-verification=kDVIO-3JicgMGQ1CrZz3C8usMiZNyZnL1OyUmtMJrCE'
+    octodns:
+      cloudflare:
+        auto-ttl: true
+
+# Mail DMARC Policy
+_dmarc:
+  - type: TXT
+    values:
+      - 'v=DMARC1\;  p=none\; rua=mailto:[email protected]'
+    octodns:
+      cloudflare:
+        auto-ttl: true
+
+# GitHub Verification
+_github-challenge-tj-uav-org:
+  - type: TXT
+    values:
+      - d0570330b0
+    octodns:
+      cloudflare:
+        auto-ttl: true
+
+# Subdomains
+www:
+  - type: CNAME
+    value: tj-uav.github.io.
+    octodns:
+      cloudflare:
+        proxied: true
+        auto-ttl: true
+
+docs:
+  - type: CNAME
+    value: 1a120fb909-hosting.gitbook.io.
+    octodns:
+      cloudflare:
+        proxied: false
+        auto-ttl: true