[BUG] Correct card "reversed" terminology, should be "bidirectional"

[ronzulu]

Describe the bug

In the documentation, there are card types "Single-line Reversed" and "Multi-line Reversed".
https://www.stephenmwangi.com/obsidian-spaced-repetition/flashcards

("Single-line Reversed" is termed slightly differently in the plug-in's settings as "inline reversed")

"Reversed" is inaccurate and led to user issues:

• [FEAT] Bi-directional cards
• [BUG] Reversed flashcards inconsistent order

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Expected behavior

Synonyms for "bidirectional" are:
https://www.synonym.com/synonyms/bidirectional

bifacial - "having two faces or fronts" - not appropriate
duplex - "allowing communication in opposite directions simultaneously" - not appropriate
two-way - valid, but would lead to terms "Single-line two-way" and "Multi-line two-way", which isn't as straightforward as "Single-line bidirectional" and "Multi-line bidirectional"

Change terminology to refer to existing functionality as "bidirectional" rather than "reversed" in:

• Documentation
• Plug-in settings