make h1/h2/etc. less overwhelming, fixes CNVS-5006
make h1/h2/etc. less overwhelming, fixes CNVS-5006

reverts their size and weight to pre-bootstrap

test plan
1. use canvas
2. headings should not be ridiculously shouty

Change-Id: Ic01c9d8fe14f9aac64a43ef115dc447577dd2dfd
Reviewed-on: https://gerrit.instructure.com/19153
Reviewed-by: Eric Berry <b4e131942074b4e4dafdcc14a63e85b7d8e18577@instructure.com>
Reviewed-by: Stanley Stuart <2b43fb8b7a234825d50dd49ce7892d78a59da8f3@instructure.com>
QA-Review: Cam Theriault <b4133c36b6d893d0872cc09e87b536d16aa2d241@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Product-Review: Jon Jensen <44f878afe53efc66b76772bd845eb65944ed8232@instructure.com>

arrivu/qibla-ecampus,HotChalk/canvas-lms,landonwilkins/canvas-lms,arrivu/qibla-ecampus,roxolan/canvas-lms,leftplusrightllc/canvas-lms,djbender/canvas-lms,whalejasmine/canvas-lms,HotChalk/canvas-lms,venturehive/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,wrdsb/canvas-lms,va7map/canvas-lms,landonwilkins/canvas-lms,usmschuck/canvas,wrdsb/canvas-lms,tgroshon/canvas-lms,Unow/ins,Rvor/canvas-lms,matematikk-mooc/canvas-lms,fronteerio/canvas-lms,jay3126/canvas-lms,sli7246/canvas_branch,juoni/canvas-lms,Jyaasa/canvas-lms,kyroskoh/canvas-lms,tgroshon/canvas-lms,AndranikMarkosyan/lms,instructure/canvas-lms,arrivu/hoodemo,tgroshon/canvas-lms,sdeleon28/canvas-lms,skmezanul/canvas-lms,leftplusrightllc/canvas-lms,greyhwndz/canvas-lms,venturehive/canvas-lms,wimemx/Canvas,snehakachroo1/LSI_replica,shidao-fm/canvas-lms,juoni/canvas-lms,SwinburneOnline/canvas-lms,redconfetti/canvas-lms,whalejasmine/canvas-lms,loganrun/pincan,Unow/canvas-lms,whalejasmine/canvas-lms,ShreniiNepal/shrenii_lmp,roxolan/canvas-lms,efrj/canvas-lms,jay3126/canvas-lms,grahamb/canvas-lms,greyhwndz/canvas-lms,wimemx/Canvas,arrivu/qibla-ecampus,arrivu/jigsaw-lms,antoniuslin/canvas-lms,efrj/canvas-lms,sdeleon28/canvas-lms,djbender/canvas-lms,roxolan/canvas-lms,SwinburneOnline/canvas-lms,utkarshx/canvas-lms,greyhwndz/canvas-lms,shidao-fm/canvas-lms,narigone/canvas,arrivu/arrivu-lms,efrj/canvas-lms,wrdsb/canvas-lms,matematikk-mooc/canvas-lms,Jyaasa/canvas-lms,greyhwndz/canvas-lms,SwinburneOnline/canvas-lms,loganrun/pincan,AndranikMarkosyan/lms,leftplusrightllc/canvas-lms,kyroskoh/canvas-lms,wimemx/Canvas,dgynn/canvas-lms,ShreniiNepal/shrenii_lmp,grahamb/canvas-lms,sfu/canvas-lms,Jyaasa/canvas-lms,kyroskoh/canvas-lms,sli7246/canvas_branch,wrdsb/canvas-lms,sfu/canvas-lms,matematikk-mooc/canvas-lms,djbender/canvas-lms,eCNAP/CANVAS,redconfetti/canvas-lms,redconfetti/canvas-lms,jay3126/canvas-lms,sdeleon28/canvas-lms,va7map/canvas-lms,ShreniiNepal/shrenii_lmp,arrivu/arrivu-lms,wye0220/shindig-canvas,roxolan/canvas-lms,grahamb/canvas-lms,merichar/canvas-lms,sdeleon28/canvas-lms,utkarshx/canvas-lms,fronteerio/canvas-lms,ShreniiNepal/shrenii_lmp,dgynn/canvas-lms,dgynn/canvas-lms,snehakachroo1/LSI_replica,Rvor/canvas-lms,venturehive/canvas-lms,shidao-fm/canvas-lms,samuels410/greatlakes-lms,wye0220/shindig-canvas,skmezanul/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,usmschuck/canvas,samuels410/greatlakes-lms,utkarshx/canvas-lms,Rvor/canvas-lms,loganrun/pincan,djbender/canvas-lms,arrivu/hoodemo,landonwilkins/canvas-lms,leftplusrightllc/canvas-lms,narigone/canvas,redconfetti/canvas-lms,usmschuck/canvas,SwinburneOnline/canvas-lms,Unow/canvas-lms,antoniuslin/canvas-lms,instructure/canvas-lms,efrj/canvas-lms,skmezanul/canvas-lms,tgroshon/canvas-lms,instructure/canvas-lms,snehakachroo1/LSI_replica,AndranikMarkosyan/lms,instructure/canvas-lms,fronteerio/canvas-lms,Unow/ins,arrivu/arrivu-lms,merichar/canvas-lms,instructure/canvas-lms,Jyaasa/canvas-lms,jay3126/canvas-lms,instructure/canvas-lms,snehakachroo1/LSI_replica,fronteerio/canvas-lms,eCNAP/CANVAS,juoni/canvas-lms,narigone/canvas,narigone/canvas,landonwilkins/canvas-lms,arrivu/hoodemo,utkarshx/canvas-lms,eCNAP/CANVAS,kyroskoh/canvas-lms,eCNAP/CANVAS,dgynn/canvas-lms,va7map/canvas-lms,merichar/canvas-lms,Unow/ins,grahamb/canvas-lms,sfu/canvas-lms,va7map/canvas-lms,HotChalk/canvas-lms,whalejasmine/canvas-lms,sli7246/canvas_branch,antoniuslin/canvas-lms,Unow/canvas-lms,antoniuslin/canvas-lms,instructure/canvas-lms,juoni/canvas-lms,gbleydon/canvas-lms,arrivu/jigsaw-lms,skmezanul/canvas-lms,Rvor/canvas-lms,matematikk-mooc/canvas-lms,wye0220/shindig-canvas,arrivu/jigsaw-lms,gbleydon/canvas-lms,samuels410/greatlakes-lms,HotChalk/canvas-lms,samuels410/greatlakes-lms,usmschuck/canvas,shidao-fm/canvas-lms,AndranikMarkosyan/lms,gbleydon/canvas-lms