Clarify sets of URL conventions for wikis
Users have trouble with obsolete/outdated URLs like https://forums.ohwr.org/uploads/default/original/1X/ee3cb4c4d4ade49c72f7c912339071ce86735566.png being actually https://ohwr.org/project/wr-cores/wikis/TxRx-Streamers
Note also the
- /wiki/ vs. /wikis/,
- /project/ vs. /projects/,
- underscore vs. hyphen problemology and what ensues. Plus, the projects? rules do not take into account the pre-existing project hierarchy.