add changelog for 1.4.0 (#3435)
add changelog for 1.4.0 (#3435)

* add changelog for 1.4.0

* remove docs

* Remove some more noise

* Small reorganization, removed bugfixes that were not present in last stable version

* Move LFS lock to features, add just merged bugfix info

lunny/gitea,typeless/gitea,cez81/gitea,Bwko/gitea,vCaesar/gitea,lunny/gitea,tboerger/gitea,go-gitea/gitea,cez81/gitea,kjellkvinge/gitea,go-gitea/gitea,typeless/gitea,tboerger/gitea,sapk-fork/gitea,dnmgns/gitea,dnmgns/gitea,Bwko/gitea,typeless/gitea,lafriks/gitea,kubatyszko/gitea,lafriks/gitea,lunny/gitea,go-gitea/gitea,dnmgns/gitea,typeless/gitea,cez81/gitea,sapk-fork/gitea,kubatyszko/gitea,kjellkvinge/gitea,kubatyszko/gitea,vdbt/gitea,Bwko/gitea,kjellkvinge/gitea,vdbt/gitea,sapk-fork/gitea,vCaesar/gitea,sapk-fork/gitea,lafriks/gitea,tboerger/gitea