[Feature] Custom conversion tool for gym specs

ghstack-source-id: d38bb02
Pull Request resolved: pytorch#2726

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[Doc] Fix links in doc (pytorch#2151)

(cherry picked from commit 5b9cb44)

[BugFix] Fix broken gym tests (pytorch#1980)

torchrl v0.3.0

[Release] 0.2.1 (pytorch#1642)

[Versioning] moving tag

[Versioning] v0.1.1 (pytorch#1137)

init