[exercise-basic] remove input-parameter tasks in readme

exercises/exercise-basic/README.md

@@ -55,60 +55,7 @@ paraview injection-2p2c.pvd
 ```
 
 <hr><br><br>
-### Task 3: Changing input parameters
-<hr>
-
-In the input file `exercise1.input` you can find the following section
-
-```ini
-[SpatialParams]
-EntryPressureAquitard = 4.5e4
-EntryPressureAquifer = 1e4
-```
-
-* Change the values for the aquitard entry pressure in the input file to a lower value and compare the results with the previous solution. You don't need to recompile the executable.
-
-<hr><br><br>
-### Task 4: Runtime parameters
-<hr>
-
-The injection rate is currently hard-coded in `injection2p2cproblem.hh` to $`1e-4 kg/(s m^2)`$.
-
-```c++
- // set the Neumann values for the Nitrogen component balance
- // convert from units kg/(s*m^2) to mole/(s*m^2)
-values[Indices::contiNEqIdx] = -1e-4/FluidSystem::molarMass(FluidSystem::nCompIdx);
-values[Indices::contiWEqIdx] = 0.0;
-```
-
-We want to be able to set it at runtime. To this end,
-* use the following DuMuX macro to read a runtime parameter from the input file
-
-```c++
-// read the injection rate from the input file at run time
-totalAreaSpecificInflow_ = getParam<TYPE>("GROUPNAME.PARAMNAME");
-```
-
-* Replace
-`<TYPE>`,`<GROUPNAME>`,`<PARAMNAME>` by what is appropriate for your case:
-  * `<TYPE>` is the type of the parameter to read
-  * `<GROUPNAME>` is the group in the input file
-  * `<PARAMNAME>` is the name of the parameter in the input file
-
-Note that due to the way the macro works, the names are specified as plain text within the "quotation marks".`<GROUPNAME>` and `<PARAMNAME>` need to be separated by a dot (.).
-Follow the instructions given as a
-
-```c++
-// TODO: dumux-course-task
-```
-in the `injection2p2cproblem.hh` file and also remember to also set the parameter totalAreaSpecificInflow in the input file.
-
-* Check the influence of that parameter on the simulation result by rerunning the simulation with different injection rates. Remember to also set the parameter totalAreaSpecificInflow in the input file.
-
-Since you have changed your header file, you have to recompile the program.
-
-<hr><br><br>
-### 5. Setting up a new executable (for a non-isothermal simulation)
+### Task 3: Setting up a new executable (for a non-isothermal simulation)
 <hr>
 
 * Copy the main file `exercise1_2p.cc` and rename it to `exercise1_2pni.cc`
@@ -131,7 +78,7 @@ make exercise1_2pni # builds new executable
 ```
 
 <hr><br><br>
-### 6. Setting up a non-isothermal __2pni__ test problem
+### Task 4: Setting up a non-isothermal __2pni__ test problem
 <hr>
 
 * Open the file `injection2pniproblem.hh`. It is a copy of the `injection2pproblem.hh` with some useful comments on how to implement a non-isothermal model. Look for comments containing