WIP: Rename caosdb -> linkahead (docs)

src/doc/administration.rst

src/doc/concepts.rst

src/doc/configuration.md

src/doc/future_linkahead.md

src/doc/gallery/curator-permissions.rst

src/doc/gallery/index.rst

src/doc/gallery/simulation.py

src/doc/gallery/simulation.rst

src/doc/high_level_api.org

src/doc/high_level_api.rst

src/doc/index.rst

src/doc/tutorials/Data-Insertion.rst

src/doc/tutorials/Entity-Getters.rst

src/doc/tutorials/basic_analysis.rst

src/doc/tutorials/caching.rst

src/doc/tutorials/complex_data_models.rst

src/doc/tutorials/data-model-interface.md

src/doc/tutorials/errors.rst

src/doc/tutorials/first_steps.rst

src/doc/tutorials/index.rst