close OpenGov research RFP (w3f#2414)

With a few teams failing to gather support from the treasury, and the grants program not being fond of funding these projects either, I think it's time to accept that this RFP was a nice idea but seems to be baiting teams to put in effort into both OpenGov and Grant applications destined to fail.

References: 
[referenda w3f#1](https://polkadot.polkassembly.io/referenda/1204)
[referanda w3f#2](https://polkadot.polkassembly.io/referenda/1180)
w3f#2397

docs/rfps.md

@@ -26,7 +26,6 @@ If you find an open RFP here that you think you can address, feel free to [submi
 
 | RFP | Last Updated |
 | :-- | :----------: |
-| [action_research_opengov.md](RFPs/action_research_opengov.md) | 31.05.2024 |
 | [anti-collusion_infrastructure.md](RFPs/anti-collusion_infrastructure.md) | 21.09.2023 |
 | [formal_guarantees_for_grandpa.md](RFPs/formal_guarantees_for_grandpa.md) | 12.10.2023 |
 | [ISO_20022.md](RFPs/ISO_20022.md) | 12.10.2023 |  
@@ -66,6 +65,7 @@ If you find an open RFP here that you think you can address, feel free to [submi
 
 | RFP | Last Updated |
 | :-- | :----------: |
+| [action_research_opengov.md](RFPs/action_research_opengov.md) | 31.05.2024 |
 | [a-and-v-topology.md](RFPs/a-and-v-topology.md) | 04.09.2023 |
 | [alternative-polkadot-js-api-console.md](RFPs/alternative-polkadot-js-api-console.md) | 19.05.2023 |
 | [appi.md](RFPs/appi.md) | 20.07.2021 |