🔹[EPIC] Migrate documentation and examples to RS SDK 5.0.0

[gagdiez]

Description

NEAR SDK RS 5.0.0 has been released, we now need to update all docs and docs

### Related Issues
- [ ] https://github.com/near/docs/issues/1745
- [ ] https://github.com/near/docs/issues/1746
- [x] https://github.com/near/docs/issues/1747
- [x] https://github.com/near/docs/issues/1756
- [x] https://github.com/near/docs/issues/1755
- [x] https://github.com/near/docs/issues/1754
- [x] https://github.com/near/docs/issues/1753
- [x] https://github.com/near/docs/issues/1752
- [x] https://github.com/near/docs/issues/1751
- [x] https://github.com/near/docs/issues/1750
- [x] https://github.com/near/docs/issues/1749
- [x] https://github.com/near/docs/issues/1748

[flmel]

For integrations tests on the examples do you think we should be going with javascript/ava or follow the cargo near structure ant test with near_workspaces?

[gagdiez]

@flmel sorry for never answering. I guess a good compromise is: workspaces-js for JS projects, workspaces-rs for RS projects

[mikedotexe]

Looks like there are some nice changes to reflect. I love how they have the scrolling "before" and "after" here: https://github.com/near/near-sdk-rs/releases/tag/near-sdk-v5.1.0

Here's an example showing how to use the #[near] macro: https://github.com/NEAR-DevHub/neardevhub-contract/pull/103/files#diff-0138e1668433cf4b746a3d18b143e0a7bd1465d8f67989f7956f52076298b259R14

Think we can simplify stuff like this (and elsewhere)

https://docs.near.org/sdk/rust/contract-structure/near-bindgen

[flmel]

Thanks @mikedotexe addressing it in #1964