Add CI for sphinx doc builds

Signed-off-by: Travis F. Collins <travis.collins@analog.com>

.github/doc/styles/ADI/Capitalization.yml

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+extends: capitalization
+message: "'%s' should be in title case"
+level: warning
+scope: sentence
+# $title, $sentence, $lower, $upper, or a pattern.
+#match: $title
+#style: AP # AP or Chicago; only applies when match is set to $title.
+exceptions:
+  - ADC
+  - DAC
+  - adc
+  - dac

.github/doc/styles/ADI/Spelling.yml

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+extends: spelling
+message: "Did you really mean '%s'?"
+level: error
+ignore:
+  - Vocab/Sphinx/accept.txt

.github/doc/styles/ADI/Terms.yml

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+# `extends` specifies the extension point you're using. Here, we're
+# using `substitution` to ensure correct usage of some techincal and 
+# brand-specifc terminology.
+extends: substitution
+# `message` allows you to customize the output shown to your users.
+message: Use '%s' instead of '%s'.
+# We're setting this rule's severity to `error`, which will cause
+# CI builds to fail.
+level: error
+# We're using case-insensitive patterns.
+ignorecase: true
+swap:  
+  libIIO: libiio
+  linux: Linux

.github/doc/styles/Google/Units.yml

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+extends: existence
+message: "Put a nonbreaking space between the number and the unit in '%s'."
+link: 'https://developers.google.com/style/units-of-measure'
+nonword: true
+level: warning
+tokens:
+  - \d+(?:B|kB|MB|GB|TB)
+  - \d+(?:ns|ms|s|min|h|d)

.github/doc/styles/config/vocabularies/Sphinx/accept.txt

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+adijif
+204B
+204C
+JESD204B
+JESD204C
+libiio
+pypi
+conda
+JESD
+ADI
+SYSREF
+LMFC
+AD-FMCDAQ2-EBZ
+AD9523-1
+AD9528
+AD9680
+ADRV9009
+HMC7044
+Nox
+pyenv
+bashrc
+zshrc
+Makefile
+Ultrascale
+Ultrascale+
+[aA][dD][cC]
+[dD][aA][cC]
+PLL
+[nN]ox
+[mM]ultiblock
+codecov
+mux
+muxes
+muxing
+Fmax
+parameterization
+clk
+[xX]ilinx
+(?i)fpgas
+fpga
+Scopy
+sysfs
+iiod
+IIOD
+usb
+Jetson
+Mbed
+repo
+github
+iio_context
+iio_device
+iio_channel
+iio_buffer
+iio_scan_context
+iio_attr
+iio_reg
+iio_info
+iio_readdev
+iio_writedev
+iio_rwdev
+iio_stresstest
+iio_genxml
+arg
+pid
+hostname
+data_bits
+parity_bits
+stop_bits
+flow_control
+Xon
+Xoff
+
+ip
+uri
+deinterleave
+endianness
+zeroconf
+attr
+Doxygen
+Nechita

.github/workflows/doc.yml

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+name: Documentation Tests
+
+on: [push, pull_request]
+
+jobs:
+  CheckDocs:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get -qq update
+          sudo apt-get install -y git cmake graphviz libavahi-common-dev libavahi-client-dev libaio-dev libusb-1.0-0-dev libxml2-dev rpm tar bzip2 gzip flex bison git libzstd-dev doxygen pandoc
+          mkdir build
+          cd build
+          cmake .. -DWITH_MAN=ON -DHAVE_DNS_SD=OFF
+          make
+          sudo make install
+          cd ..
+          cd docs
+          pip install -r requirements_doc.txt
+          cd ..
+
+      - name: Build man pages
+        run: |
+          cd docs
+          python man_to_rst.py
+          cd ..
+
+      - name: Check doc build
+        run: |
+          cd docs
+          make html SPHINXOPTS="-W"
+          cd ..
+
+    #   - name: Check doc coverage
+    #     run: |
+    #       cd docs
+    #       make coverage
+    #       cat build/coverage/python.txt
+    #       cat build/coverage/python.txt | wc -l | xargs -I % test % -eq 2
+    #       cd ..
+
+      - name: Check doc links
+        run: |
+          cd docs
+          make linkcheck
+          cd ..

.github/workflows/vale.yml

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+name: reviewdog
+on: [pull_request,push]
+
+jobs:
+  vale:
+    name: runner / vale
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: errata-ai/vale-action@reviewdog
+        with:
+          files: docs/source