Fixes #3713 - Fixes for broken/invalid links and typos #3728
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This is a combined PR to address the following issues:
Redirect link of "Firefox Nightly" on "TOOLS TO REPORT AN ISSUE" section has an extra character (#3712)
Typo displayed in the description of "In Browser" from "TOOLS TO REPORT AN ISSUE" (#3713)
Unable to join mailing list, page not found (#3716)
The link to revoke webcompat app authorization is wrong (#3719)
Dead link in "Organize Webcompat events" article (#3726)