doc - list HONEE in libCEED backends svg

doc: update libCEEDBackends.svg

* include .tex source for future updates
* latex .gitignore

interface - remove legacy CEED_BASIS_COLLOCATED

doc: rename libCEED.svg to avoid latex build issue

sphinx/pandoc creates libCEED.pdf from libCEED.svg and places it in the
latex build directory where the manual, also named libCEED.pdf, needs to
go

doc: rename libCEED.svg to avoid latex build issue

sphinx/pandoc creates libCEED.pdf from libCEED.svg and places it in the
latex build directory where the manual, also named libCEED.pdf, needs to
go. Renaming avoids this conflict and circular include that breaks latex.

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Remove stray backslashes from figure text

Add combined setup/mass schematic to documentation

doc: Add new schematic and draft of operator-specific version for mass matrix

doc: add new operator data flow schematic

doc: add libCEED.svg

Doc - update backend diagram

Docs: add cubed-sphere image in examples/petsc section

Small doc fixes (#499)

* A small shift in notation

* Docs: Clarify ex2-surface mathematical description

* Refactor \boldsymbol -> \bm

* Refactor \mathbf -> \bm

* Sphinx: clear html_stati

Small doc fixes (#499)

* A small shift in notation

* Docs: Clarify ex2-surface mathematical description

* Refactor \boldsymbol -> \bm

* Refactor \mathbf -> \bm

* Sphinx: clear html_static_path

This is needed to avoid the 'html_static_path entry '_static' does not exist' warning

https://github.com/readthedocs/readthedocs.org/issues/1776

* Fix some incosistencies

* Invert inner products (u,v) -> (v,u)

* Add SVG figure for coordinates on the sphere

* doc: use dirhtml on readthedocs

* Improve caption of sphere coords figure

* Add reference to figure in the bps on the cubed-sphere section

Co-authored-by: Jed Brown <jed@jedbrown.org>

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doc: convert to Sphinx documentation at libceed.readthedocs.io

Some technical notes about the expanded docs/process:

* Doxygen is now restricted to API documentation. Sphinx docs are
incomplete

doc: convert to Sphinx documentation at libceed.readthedocs.io

Some technical notes about the expanded docs/process:

* Doxygen is now restricted to API documentation. Sphinx docs are
incomplete surrogates due to not hyperlinking code listings, though
we hope the Doxygen site can be removed eventually.

* PDF output uses XeTeX (unicode and OTF fonts) with TeX Gyre Pagella
and DejaVu Sans Mono. You may need to install these fonts in order
to build the PDF users manual.

* Obtaining the author list from Git has not worked on
ReadTheDocs (`git shortlog` is empty even though `git log` is not),
so we automatically generate it on developer machines with `make
doc`. If the author information is incorrect/mangled, edit .mailmap
to fix the mapping.

* Math semantics are based on the description here
https://github.com/sphinx-doc/sphinx/issues/3785

Sphinx chooses one of two setups for the maths.

* If there is a single equation, then we wrap the maths in
\begin{equation*} (or equation).

* If there are multiple equations (as determined by the presence of
an empty line), then we wrap the maths first in \begin{aligned}
and then in \begin{align*} (or align).

Co-authored-by: Jeremy L. Thompson <jeremy.thompson@colorado.edu>
Co-authored-by: Jed Brown <jed@jedbrown.org>

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