remove outdated architecture section from docs

docs/dev/architecture.rst

@@ -1,14 +0,0 @@
-.. _architecture:
-
-Architecture
-============
-
-To give you a better understanding of how mitmproxy works, mitmproxy's
-high-level architecture is detailed in the following graphic:
-
-.. image:: ../schematics/architecture.png
-
-:download:`architecture.pdf <../schematics/architecture.pdf>`
-
-Please don't refrain from asking any further
-questions on the mailing list, the Slack channel or the GitHub issue tracker.

docs/index.rst

@@ -80,7 +80,6 @@
     :hidden:
     :caption: Hacking
 
-    dev/architecture
     dev/testing
     dev/sslkeylogfile