Updated the default page to all events, in manage events.

Title

Updated the default view in Manage Events to All events instead of help doc.

what is the purpose of this PR? to update the default view in manage events page.
what is the original vs the new behaviour? previously showing help doc, now showing all events.

Put an x in the boxes that apply

[ ] Feature (non-breaking change which adds functionality)
[ ] Bug Fix (non-breaking change that fixes an issue)
[ ] Breaking Change (feature/fix that causes existing features to not work as expected)
[ x] Documentation

[x ] I have read the [contribute]contributing doc
[ x] Classes, scripts, and environment variables follow existing naming convention
[ x] Lint and Unit tests pass locally
[ x] New features on hardware have been tested on a local Raspberry Pi
[ x] Mention new programs/binaries if any must be installed along with this change
[ x] Mention new environment variables if any have been added to hardware/env file
[ x] Please make sure test coverage does not drop. If it does, please explain the reasons.
[ x] Any new required python modules are added to the requirements.txt