Change build badge branch for rolling to master

[fmauch]

THe README was stating that for rolling the rolling branch should be used. However, this does not exist and instead the master branch should be used.

While writing #1034 I realized that the README was stating that Rolling is built from the roling branch. Also, the documentation links were pointing to master for the humble build.

[fmauch]

Updated author information, as I had setup my container wrong.

[codecov-commenter]

Codecov Report

Merging #1035 (54b3dde) into master (925f5f3) will decrease coverage by 2.17%.
The diff coverage is 35.16%.

❗ Current head 54b3dde differs from pull request most recent head 27020b2. Consider uploading reports for the commit 27020b2 to get more accurate results

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@@            Coverage Diff             @@
##           master    #1035      +/-   ##
==========================================
- Coverage   34.61%   32.45%   -2.17%     
==========================================
  Files          52       92      +40     
  Lines        2981     9681    +6700     
  Branches     1855     6511    +4656     
==========================================
+ Hits         1032     3142    +2110     
- Misses        310      772     +462     
- Partials     1639     5767    +4128     

Flag	Coverage Δ
unittests	32.45% <35.16%> (-2.17%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
controller_manager/src/controller_manager.cpp	38.23% <ø> (-1.48%)	⬇️
controller_manager/src/ros2_control_node.cpp	0.00% <0.00%> (ø)
..._interface/include/hardware_interface/actuator.hpp	100.00% <ø> (ø)
...ce/include/hardware_interface/async_components.hpp	0.00% <0.00%> (ø)
...re_interface/include/hardware_interface/sensor.hpp	100.00% <ø> (ø)
...re_interface/include/hardware_interface/system.hpp	100.00% <ø> (ø)
hardware_interface/src/resource_manager.cpp	47.16% <ø> (-6.47%)	⬇️
hardware_interface/src/sensor.cpp	50.52% <ø> (ø)
hardware_interface/src/system.cpp	55.45% <ø> (ø)
...rface/test/mock_components/test_generic_system.cpp	9.53% <ø> (ø)
... and 69 more

... and 19 files with indirect coverage changes

[bmagyar]

Thank you!