fix: show rule that do not have accessibility mapping requirements

[jeeyyy]

• show rule that do not have accessibility mapping requirements (eg: ARIA attribute is valid)

Closes issue(s):

• Some rules don't show up on the website #697

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[Jym77]

It this closing #697 ?

[jeeyyy]

Note: This change will list all rules that do not have accessibility_requirements and this includes atomic rules used in composite rules. This needs to be discussed on a call, to make a decision if it is worth listing atomic rules in the rules page.

Various options:

• show all rules (atomic, composite, rules that do not have accessibility_requirements)
• show all rules, except atomic rules
• may be we can have filtering on the page instead?

[jeeyyy]

Add filtering to the page, iteratively (start simple)

Perhaps fields that can be in the filtering:

• name/ keyword/ terms
• id
• accessibility requirements
• number of implementations
• success criteria
• input rules
• rule type