docs: change `troubles` references to `instability`
Per https://www.mercurial-scm.org/wiki/CEDVocabulary. There are a couple
instances of 'troublesome' which probably need a word, as deriviatives of
'instability' didn't really fit. At least some of these are in the unlinked
obs-terms.rst page.
all: tutorials/tutorial.rst tutorials/topic-tutorial.rst static/logo-evolve.ico
sphinx-build . ../html/
tutorials/tutorial.rst: tutorials/tutorial.t test2rst.py
python test2rst.py tutorials/
tutorials/topic-tutorial.rst: tutorials/topic-tutorial.t test2rst.py
python test2rst.py tutorials/
static/logo-evolve.ico: static/logo-evolve.svg
convert -resize 36x36 static/logo-evolve.svg static/logo-evolve.ico