docs: Remove headers made redundant by ToC captions
docs: Remove headers made redundant by ToC captions

(cherry picked from commit d942ae0555398630cc7f064ad364c5a5df5f7735)

bacontext/mopidy,adamcik/mopidy,hkariti/mopidy,jmarsik/mopidy,tkem/mopidy,tkem/mopidy,bacontext/mopidy,ZenithDK/mopidy,mokieyue/mopidy,mopidy/mopidy,jmarsik/mopidy,jmarsik/mopidy,pacificIT/mopidy,hkariti/mopidy,tkem/mopidy,swak/mopidy,quartz55/mopidy,hkariti/mopidy,mopidy/mopidy,diandiankan/mopidy,pacificIT/mopidy,jmarsik/mopidy,kingosticks/mopidy,kingosticks/mopidy,vrs01/mopidy,ali/mopidy,jcass77/mopidy,pacificIT/mopidy,bacontext/mopidy,adamcik/mopidy,tkem/mopidy,swak/mopidy,hkariti/mopidy,pacificIT/mopidy,jcass77/mopidy,ZenithDK/mopidy,jodal/mopidy,mokieyue/mopidy,ali/mopidy,bacontext/mopidy,mopidy/mopidy,vrs01/mopidy,quartz55/mopidy,vrs01/mopidy,quartz55/mopidy,ZenithDK/mopidy,vrs01/mopidy,mokieyue/mopidy,jodal/mopidy,diandiankan/mopidy,ZenithDK/mopidy,kingosticks/mopidy,jodal/mopidy,mokieyue/mopidy,swak/mopidy,diandiankan/mopidy,diandiankan/mopidy,ali/mopidy,adamcik/mopidy,quartz55/mopidy,jcass77/mopidy,ali/mopidy,swak/mopidy