Clean the 'doc' folder of the I-Simpa documentation

[Picaut]

• [x] Remove old files and unnecessary ressources
• [x] Add HTML documentation (see #161)
• [x] Create a specific folder for each tutorial in the documentation
• [ ] Add a 'Round Robin' folder, with separate folder for each Round Robin in Acoustics (see #160)

\doc
\doc\documentation \doc\documentation\I-Simpa -> the build HMTL from readthedocs + french old documentation \doc\documentation\Development \doc\documentation\Scripting \doc\tutorial \doc\tutorial\tutorial 1 (when ready) \doc\tutorial\tutorial 2 (when ready) \doc\tutorial\tutorial 3 (when ready) \doc\tutorial\script 1 (when ready) \doc\roundrobin \doc\roundrobin\round robin I (when ready) \doc\roundrobin\round robin II (when ready) \doc\roundrobin\round robin III (when ready) \doc\ressources \doc\ressources\material (examples of import files)

[Picaut]

Still necessary to include the Round Robin test in a next release.