hack: ignore file name error when buffer is org page temp buffer
extract the verification function
add function, to get all org files
improve function op/git-files-changed
add index page generation feature
Merge branch 'devel' into office
improve op/git-files-changed, update the data structure of return list
add index page auto generation feature
add tag pages auto generation feature
update description of op/generate-tags
add feature for page header enhancement
add definition of group org-page
update org-page.el, remove extra features
update org-page.el, remove extra contents
add theme feature
add customized css feature
improve file content format
extract function op/generate-tag-uri
`load-file-name' may be nil, so use buffer file name instead to avoid error
add page footer feature