docs: started work on Available Tags section
docs: started work on Available Tags section

- Added Available Tag section, moved existing 'Using JSDoc Tags' content into new section
- Started extending existing tags content

vue-styleguidist/vue-styleguidist,vue-styleguidist/vue-styleguidist,vue-styleguidist/vue-styleguidist,vue-styleguidist/vue-styleguidist