Remove old, dated material which is no longer in use

See REMOVED.md for direct link to the state of the repo which
contains those assets prior to removal.

doc/benchmarks/cpu-usage-overall-notes.txt

@@ -1,31 +0,0 @@
-Steps, roughly:
-
-Capture Task Manager using SimpleScreenRecorder
-
-Launch reference benchmark
-
-Stop and save capture once reference benchmark completes
-
-Extract/crop/scale area to OCR (the CPU figures)
-
-    avconv -i ublock-cpu.webm -r 4 -vsync 1 -vf "[in] crop=40:86:310:100 [T1], [T1] scale=160:360 [out]" -t 2400 img/img-%04d.png
-
-Execute tesseract custom script:
-
-    ./tessall
-
-`all.txt` contains a csv of the results.
-Paste in spreadsheet. Etc.
-
-
-`tessal` script:
-
-    #!/bin/sh
-    rm all.txt
-    echo
-    for i in img/img*.png; do
-        echo -ne '\r' $i
-        b=`basename $i .png`
-        tesseract $i out -psm 6 digits 1>/dev/null 2>&1
-        cat out.txt | perl -p -000 -e 's/(\d+)\s+/\1,/g' | perl -pe 's/,$/\n/' >> all.txt
-    done