[docs] Remove as many redirects as possible (#125663) (#126045)

* remove as many assembler-related redirects as possible

* Update docs/redirects.yml

* delete more unused temp redirects

* remove more redirects

* remove all redirects to see remaining errors

(cherry picked from commit 0e53732)

Co-authored-by: Colleen McGinnis <[email protected]>

Author: leemthompo