chore: move to trunk-based development (#455)

* ci: remove ability to run drone pipelines on develop

* ci(sc): trigger deploy smart contract to staging by dispatch on main branch

* ci(subgraph): trigger deploy subgraph to staging by dispatch on main branch

* ci(sdk): restrict npm publish to main branch

* ci(deserializer): restrict npm publish to main branch

* ci: remove npm publish pipelines from drone (moved to GHA)

* chore(subgraph): clean outdated readme

Author: PierreJeanjacquot