front-end: fix documentation regarding theme.less file

The documentation stated that a theme.less file can be placed in the
Kallithea root directory, but this is not true. The file is expected in
kallithea/front-end to take effect.

Update the documentation and .hgignore file.

.hgignore

@@ -1,53 +1,53 b''
 syntax: glob
 *.pyc
 *.swp
 *.sqlite
 *.tox
 *.egg-info
 *.egg
 *.mo
 *.bak
 .eggs/
 tarballcache/
 
 syntax: regexp
 ^rcextensions
 ^build
 ^dist/
 ^docs/build/
 ^docs/_build/
 ^data$
 ^sql_dumps/
 ^\.settings$
 ^\.project$
 ^\.pydevproject$
 ^\.coverage$
 ^kallithea/front-end/node_modules$
 ^kallithea/front-end/package-lock\.json$
+^kallithea/front-end/theme\.less$
 ^kallithea/front-end/tmp$
 ^kallithea/public/codemirror$
 ^kallithea/public/css/select2-spinner\.gif$
 ^kallithea/public/css/select2\.png$
 ^kallithea/public/css/select2x2\.png$
 ^kallithea/public/css/style\.css$
 ^kallithea/public/css/style\.css\.map$
 ^kallithea/public/js/bootstrap\.js$
 ^kallithea/public/js/dataTables\.bootstrap\.js$
 ^kallithea/public/js/jquery\.atwho\.min\.js$
 ^kallithea/public/js/jquery\.caret\.min\.js$
 ^kallithea/public/js/jquery\.dataTables\.js$
 ^kallithea/public/js/jquery\.flot\.js$
 ^kallithea/public/js/jquery\.flot\.selection\.js$
 ^kallithea/public/js/jquery\.flot\.time\.js$
 ^kallithea/public/js/jquery\.min\.js$
 ^kallithea/public/js/select2\.js$
-^theme\.less$
 ^kallithea\.db$
 ^test\.db$
 ^Kallithea\.egg-info$
 ^my\.ini$
 ^fabfile.py
 ^\.idea$
 ^\.cache$
 ^\.pytest_cache$
 /__pycache__$

docs/usage/customization.rst

@@ -1,70 +1,71 b''
 .. _customization:
 
 =============
 Customization
 =============
 
 There are several ways to customize Kallithea to your needs depending on what
 you want to achieve.
 
 
 HTML/JavaScript/CSS customization
 ---------------------------------
 
 To customize the look-and-feel of the web interface (for example to add a
 company banner or some JavaScript widget or to tweak the CSS style definitions)
 you can enter HTML code (possibly with JavaScript and/or CSS) directly via the
 *Admin > Settings > Global > HTML/JavaScript customization
 block*.
 
 
 Style sheet customization with Less
 -----------------------------------
 
 Kallithea uses `Bootstrap 3`_ and Less_ for its style definitions. If you want
 to make some customizations, we recommend to do so by creating a ``theme.less``
-file. When you create a file named ``theme.less`` in the Kallithea root
-directory, you can use this file to override the default style. For example,
-you can use this to override ``@kallithea-theme-main-color``,
-``@kallithea-logo-url`` or other `Bootstrap variables`_.
+file. When you create a file named ``theme.less`` in directory
+``kallithea/front-end/`` inside the Kallithea installation, you can use this
+file to override the default style. For example, you can use this to override
+``@kallithea-theme-main-color``, ``@kallithea-logo-url`` or other `Bootstrap
+variables`_.
 
 After creating the ``theme.less`` file, you need to regenerate the CSS files, by
 running::
 
     kallithea-cli front-end-build --no-install-deps
 
 .. _bootstrap 3: https://getbootstrap.com/docs/3.3/
 .. _bootstrap variables: https://getbootstrap.com/docs/3.3/customize/#less-variables
 .. _less: http://lesscss.org/
 
 
 Behavioral customization: rcextensions
 --------------------------------------
 
 Some behavioral customization can be done in Python using ``rcextensions``, a
 custom Python package that can extend Kallithea functionality.
 
 With ``rcextensions`` it's possible to add additional mappings for Whoosh
 indexing and statistics, to add additional code into the push/pull/create/delete
 repository hooks (for example to send signals to build bots such as Jenkins) and
 even to monkey-patch certain parts of the Kallithea source code (for example
 overwrite an entire function, change a global variable, ...).
 
 To generate a skeleton extensions package, run::
 
     kallithea-cli extensions-create -c my.ini
 
 This will create an ``rcextensions`` package next to the specified ``ini`` file.
 See the ``__init__.py`` file inside the generated ``rcextensions`` package
 for more details.
 
 
 Behavioral customization: code changes
 --------------------------------------
 
 As Kallithea is open-source software, you can make any changes you like directly
 in the source code.
 
 We encourage you to send generic improvements back to the
 community so that Kallithea can become better. See :ref:`contributing` for more
 details.