merge About this wiki into README, update

src/About-this-wiki.md

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-% About this wiki
-
-*2023-11 Old, needs update*
-
-This wiki complements the [plaintextaccounting.org](https://plaintextaccounting.org) static site. 
-It was announced in 2022-02 on the [ledger](https://groups.google.com/g/ledger-cli/c/-ylWBNTUC9Q), [beancount](https://groups.google.com/g/beancount/c/_xtg1XVbbCk), and [hledger](https://groups.google.com/g/hledger/c/bLxVpYEklk4) mail lists.
-Maintenance is led by Simon Michael; all help is welcome! You can:
-- drop in to the [#plaintextaccounting chat room](https://plaintextaccounting.org/#newsdiscussion) on Matrix.org or Libera.chat and suggest changes
-- or log in with a Github account, then use the Edit / New Page buttons at top right
-- or `git clone https://github.com/plaintextaccounting/plaintextaccounting.wiki.git`, make changes, and send a PR or push.
-
-## Goals
-
-Some current wishes (2022):
-- a page for each common transaction or situation
-- showing example journal entries, variations and alternative techniques
-- ready to use with one or more of the [PTA tools](https://plaintextaccounting.org/#plain-text-accounting-apps). Showing multiple tool-specific versions is welcome but not required. Translation/porting tips are also welcome.
-- automatically tested against tools' current release (some day)
-- crowd-sourced, human-organised, kept clean
-- relatively stable urls/ids, easily referenceable from chat rooms, docs and software
-- where helpful, consolidate work from/sync with [tool](https://github.com/ledger/ledger/wiki)-[specific](https://hledger.org/cookbook.html#accounting-tasks) [sites](https://beancount.github.io/docs/command_line_accounting_cookbook.html) to reduce duplicated effort and increase traction
-- appropriate combined use of reader-friendly plaintextaccounting.org site and editor-friendly github wiki
-
-## Shortcut urls
-
-`https://wiki.plaintextaccounting.org[/PAGE]` works as a shortcut, and the Github wiki is case- and space/hypen-insensitive, so eg any of these will work: \
-[wiki.plaintextaccounting.org](https://wiki.plaintextaccounting.org) \
-<a href="https://wiki.plaintextaccounting.org/borrowing and lending">wiki.plaintextaccounting.org/borrowing and lending</a> \
-[wiki.plaintextaccounting.org/Borrowing-and-Lending](https://wiki.plaintextaccounting.org/Borrowing-and-Lending) 
-
-## Tools
-
-Both VS Code and Obsidian work well for editing this wiki locally. 
-See the repo URL in the sidebar, eg:
-```
-git clone https://github.com/plaintextaccounting/plaintextaccounting.wiki.git
-```
-
-Obsidian's `[[Wiki Links]]` are compatible enough with Github's to be useful. Note:
-- Obsidian creates spaced page names and Github creates hyphenated-page-names by default. 
-  Spaced page names work fine on Github so it might be preferable to use those for most efficient local editing.
-- Obsidian puts alternate link text last (`[[PAGE|LINKTEXT]]`), Github puts it first `[[LINKTEXT|PAGE]]`.
-
-## Content
-
-One goal for this wiki is to collect concise useful example journal entries for all common accounting situations.
-These are organized into topic pages which get linked on [[Home]].
-
-Try to make examples reasonably reproducible.
-
-In literal blocks, consider writing a file type after the opening triple backticks. 
-Although PTA file types are not yet well supported by Github, they might be in future,
-and it can also help with automation. 
-Some suggested types:
-
-- `journal` - a generic journal file (likely compatible with ledger, hledger, and compatibles)
-- `ledger` - a ledger-specific journal file (optional)
-- `hledger` - a hledger-specific journal file (optional)
-- `beancount` - a beancount journal file
-- `timeclock` - a timeclock file
-- `timedot` - a timedot file
-- `csv`, `ssv`, `tsv` - comma, semicolon, or tab-separated values
-- `rules` - a hledger CSV rules file, ...
-- `abandon`, `tackler`, `nledger`, ... - files specific to other PTA apps
-
-In example files, consider writing the filename as a comment on the first line, 
-and using each filename only once within a page. 
-This gives example commands something to reference,
-and can help users trying out the variations,
-or automated tests.