FIO-9208: Changing the links to go to help.form.io instead of github page.

[travist]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-9208

Description

Changed all the urls that are referencing the github help page to go to help.form.io where we better maintain documentation.

Breaking Changes / Backwards Compatibility

None.

Dependencies

None.

How has this PR been tested?

Checklist:

• I have completed the above PR template
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• My changes include tests that prove my fix is effective (or that my feature works as intended)
• New and existing unit/integration tests pass locally with my changes
• Any dependent changes have corresponding PRs that are listed above