Issue #2519862 by mErilainen, kattekrab, LewisNyman, Wim Leers, DuaelFr, Bojhan, eliza411, ivanstegic, lunk_rat, nickrosencrans, stpaultim, Mark LaCroix, webchick: Remove the width/height inputs from EditorImageDialog

Issue #2513556 by dcmul, mohit_aghera, cilefen, subhojit777, hussainweb, Bojhan, eliza411, ivanstegic, LewisNyman, lunk_rat, nickrosencrans, stpaultim, Mark LaCroix, webchick: Add a link to the Block Layout page on the Appearance page

Issue #2555973 by claudiu.cristea, Mark LaCroix, stefan.r, pjonckiere, dawehner: Fatal error when editing content after disabling format with editor

Issue #2521906 by mErilainen, LewisNyman, Bojhan, eliza411, ivanstegic, lunk_rat, nickrosencrans, stpaultim, Mark LaCroix, webchick: Add default configuration to support h2-h6 level headings

Issue #2512456 by tim.plunkett, legolasbo, MattA, dawehner, googletorp, darol100, Bojhan, webchick, andypost, ivanstegic, larowlan, lauriii, LewisNyman, tkoleary, rickvug, eliza411, lunk_rat, nickrosencrans, stpaultim, Mark LaCroix: Implement the new block layout design to emphasize the primary interaction of placing a block