Fix broken wiki links on tdwg.org/activities page (table)

Fix broken wiki links on tdwg.org/activities page (table)

* [ ] GIG
* [ ] IMG
* [ ] LIT  (and mailing list)
* [ ] DwC
* [ ] OBS
* [ ] Phylo
* [ ] Process
* [ ] TAG
* [ ] GUID
* [ ] TAPIR
* [ ] TIP  <probably should archive this or change to infrastructure FS

Also need to update any references to the wiki that appear on content pages.

