Issue #3231416 by mherchel, ankithashetty, Gauravmahlawat, chetanbharambe, davidwbarratt: Olivero should not expect its default menu blocks to always exist

Issue #3225241 by mherchel, andy-blum, Gauravmahlawat, shaal, jwitkowski79, nod_: Olivero primary menu JS completely breaks if site-builder specifies over 2 levels deep

Issue #3213074 by mherchel, Indrajith KB, Gauravmahlawat: Olivero: Refactor second-level-navigation.es6.js to meet Drupal's JavaScript coding standards

Issue #3190120 by mherchel, KapilV, pragati_kanade, djsagar, andy-blum, bnjmnm, andrewmacpherson, Abhijith S, KarinG, Gauravmahlawat, benjifisher, AndyF, katannshaw: Olivero: Focused level-2 nav items should always be in viewport during keyboard navigation

Issue #3182200 by andy-blum, kiran.kadam911, mherchel, tushar_sachdeva: Follow proper BEM syntax within secondary navigation menu

Issue #3190140 by nmorin, mherchel, bnjmnm, andrewmacpherson: Collapsible nav button text should be more descriptive

Issue #3111409 by mherchel, proeung, larowlan, alexpott, lauriii, Gábor Hojtsy, andrewmacpherson, catch, xjm, andypost, rahulrasgon, rabbitlair, mrconnerton, poojakural, boulaffasae, jerseycheese, shimpy, Indrajith KB, DuneBL, kiran.kadam911, komalkolekar, keboca, hawkeye.twolf, andrewozone, Maithri Shetty, alexdmccabe, sd9121, Sreenivas Bttv, katannshaw, mgifford, nod_, webchick, mtift, rainbreaw, Berdir, brianperry, thejimbirch, Dom., q0rban, nitesh624, hansa11, himanshu_sindhwani, kostyashupenko, shaktik, bnjmnm, sharma.amitt16, sonam.chaturvedi, steinmb, shaal, ressa, Ramya Balasubramanian, Sebacic, pradeepjha, tanmaykadam, thedrupalkid, vinitk, volkswagenchick, viappidu, vebrovski, Ujval Shah, Webbeh, Yuri, trebormc, msuthars, mrinalini9, bash247, chetanbharambe, ellenoise, anevins, andriyun, CocoM, JayKandari, ambuj_gupta, hussainweb, jhodgdon, Pooja Ganjage, ju.vanderw, jwitkowski79, MaxPah, Lokender Singh2, jponch, KarenS, KarinG, Lal_: Add new Olivero frontend theme to Drupal 9.1 core as beta; later make it stable and the default