chore: do not hardcode required versions in README.md

add links to the sources of truth.

It's hard to keep up to date, the "go" one
is "wrong" (not really as an old 1.22 binray could still
download/use newer toolchains...) for example.

Signed-off-by: machine424 <ayoubmrini424@gmail.com>

README.md

@@ -67,9 +67,9 @@ Prometheus will now be reachable at <http://localhost:9090/>.
 
 To build Prometheus from source code, You need:
 
-* Go [version 1.22 or greater](https://golang.org/doc/install).
-* NodeJS [version 22 or greater](https://nodejs.org/).
-* npm [version 8 or greater](https://www.npmjs.com/).
+* Go: Version specified in [go.mod](./go.mod) or greater.
+* NodeJS: Version specified in [.nvmrc](./web/ui/.nvmrc) or greater.
+* npm: Version 8 or greater (check with `npm --version` and [here](https://www.npmjs.com/)).
 
 Start by cloning the repository: