Remove architecture doc, distribute info

Put many small READMEs and comments, facilitates exploration and is easier to maintain
5 jobs for master in 4 minutes and 47 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  .Pre
passed #510797
preflight

00:00:09

 
  Build
passed #510799
README.pdf

00:00:44

passed #510798
tex

00:03:38

 
  Test
passed #510801
test-pdfs

00:00:56

passed #510800
test-self

00:00:56