Adding docs on Trade Accounts

Adding Documentation for Trade Accounts based on !3326 (merged) and doc updates/fixes

1. Update Asset Notation
2. Updated Memo section (will conflict with !3433 (merged), merge this MR after)
3. Added Trade Asset Page - can be moved later.
4. Updated mdbook and mdbook-katex versions
5. Update Streaming Swap Min Swap bps
6. Halts page:
   1. Add Pause Lending
   2. Add a note for ILP removal
   3. Fix formatting
7. Merge Mimirs
8. Added Swapper Clout Doco