Solve check notes before releasing v0.7.0

From https://gitlab.irstea.fr/in-wop/airGRiwrm/-/jobs/355578

❯ checking CRAN incoming feasibility ... [11s/20s] NOTE
  Maintainer: ‘David Dorchies <david.dorchies@inrae.fr>’
  
  Version contains large components (0.6.2.9000)
  
  Found the following (possibly) invalid URLs:
    URL: https://g-eau.fr (moved to https://g-eau.fr/index.php/fr/)
      From: README.md
      Status: 200
      Message: OK
    URL: https://inrae.github.io/airGRiwrm (moved to https://inrae.github.io/airGRiwrm/)
      From: README.md
      Status: 200
      Message: OK
    URL: https://webgr.inrae.fr/en/home/
      From: README.md
      Status: 404
      Message: Not Found
  
  The Date field is over a month old.
❯ checking Rd line widths ... NOTE
  Rd file 'CreateGRiwrm.Rd':
    \examples lines wider than 100 characters:
       # https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/schemas/config.schema.yaml#L1878
            header = "%%{init: {'flowchart': {'nodeSpacing': 30, 'rankSpacing': 30, 'curve': 'linear'}}}%%")
  
  Rd file 'plot.GRiwrm.Rd':
    \examples lines wider than 100 characters:
       # https://github.com/mermaid-js/mermaid/blob/master/packages/mermaid/src/schemas/config.schema.yaml#L1878
            header = "%%{init: {'flowchart': {'nodeSpacing': 30, 'rankSpacing': 30, 'curve': 'linear'}}}%%")
  
  These lines will be truncated in the PDF manual.
❯ checking examples ... [29s/52s] NOTE
  Examples with CPU (user + system) or elapsed time > 5s
                           user system elapsed
  RunModel.Supervisor     7.096  0.308   8.055
  plot.GRiwrmOutputsModel 2.617  0.144   6.994
  CreateGRiwrm            0.823  0.055   6.184
  plot.GRiwrm             0.623  0.035   5.300
❯ checking HTML version of manual ... NOTE
  Skipping checking HTML validation: no command 'tidy' found