hledger-*: add pages for seven hledger subcommands (#12828)

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: spageektti <git@spageektti.cc>

pages/common/hledger-balancesheet.md

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+# hledger balancesheet
+
+> Show the end balances in asset and liability accounts.
+> More information: <https://hledger.org/hledger.html#balancesheet>.
+
+- Show the current balances in Asset and Liability accounts, excluding zeros:
+
+`hledger balancesheet`
+
+- Show just the liquid assets (Cash account type):
+
+`hledger balancesheet type:c`
+
+- Include accounts with zero balances, and show the account hierarchy:
+
+`hledger balancesheet --empty --tree`
+
+- Show the balances at the end of each month:
+
+`hledger balancesheet --monthly`
+
+- Show the balances' market value in home currency at the end of each month:
+
+`hledger balancesheet --monthly -V`
+
+- Show quarterly balances, with just the top two levels of account hierarchy:
+
+`hledger balancesheet --quarterly --tree --depth 2`
+
+- Short form of the above, and generate HTML output in `bs.html`:
+
+`hledger bs -Qt -2 -o bs.html`