Remove outdated roadmap (#463)

This PR removes outdated info from [Roadmap in
Documentation](https://dpsim.fein-aachen.org/docs/roadmap/).

Author: georgii-tishenin

docs/hugo/content/en/docs/Roadmap/index.md

@@ -7,29 +7,3 @@ weight: 8
 Short-term planning for new features is done on the GitHub [Project board](https://github.com/orgs/sogno-platform/projects/1).
 
 You can also check the [Issues List](https://github.com/sogno-platform/dpsim/issues) or the [Pull Requests](https://github.com/sogno-platform/dpsim/pulls) on GitHub.
-
-# Under Development
-
-- Solver
-   - [ ] CUDA sparse implementation
-   - [ ] improve online system matrix computation and refactorization to support nonlinear elements in network solution (NICSLU integration)
-   - [x] merge DAE solver branch
-- Interfaces
-   - [x] reimplement python interface using pybind and expose more models / functionalities
-   - [x] add python based examples using the VILLASnode interface
-   - [x] support matpower / pypower format for static simulation
-- Tests, Examples, CI
-   - [x] convert most of the examples to Python and test them against reference results in CI
-   - [x] convert more gitlab CI jobs to github actions
-   - [ ] add IEEE39 system to examples
-- Models
-   - [x] VBR generator model
-   - [ ] SVC
-   - [ ] add tap-change to transfomer
-
-# Ideas
-
-- Solver
-   - [ ] improve integration of diakoptics solver
-- Interfaces
-   - [ ] implement CIM reader in Python using new pybind interface and cimpy library